diff --git a/polymer/eduke32/build/include/mdsprite.h b/polymer/eduke32/build/include/mdsprite.h
index 22638bec3..ab7cd7720 100644
--- a/polymer/eduke32/build/include/mdsprite.h
+++ b/polymer/eduke32/build/include/mdsprite.h
@@ -128,7 +128,7 @@ typedef struct
     md3shader_t *shaders;
     md3uv_t *uv;
     md3xyzn_t *xyzn;
-    float *geometry;
+    float *geometry;  // used by Polymer
 } md3surf_t;
 
 #define SIZEOF_MD3SURF_T (11*sizeof(int32_t) + 64*sizeof(char))
@@ -244,5 +244,6 @@ voxmodel_t *voxload(const char *filnam);
 int32_t voxdraw(voxmodel_t *m, spritetype *tspr);
 
 int      md3postload_polymer(md3model_t* m);
+int32_t md_thinoutmodel(int32_t modelid, uint8_t *usedframebitmap);
 
 #endif // !_mdsprite_h_
diff --git a/polymer/eduke32/build/src/baselayer.c b/polymer/eduke32/build/src/baselayer.c
index 9976b198e..61ef41519 100644
--- a/polymer/eduke32/build/src/baselayer.c
+++ b/polymer/eduke32/build/src/baselayer.c
@@ -378,3 +378,42 @@ int32_t baselayer_init(void)
     return 0;
 }
 
+
+#if defined _WIN32
+# define WIN32_LEAN_AND_MEAN
+# include <windows.h>
+#elif defined __linux || defined __FreeBSD__ || defined __NetBSD__ || defined __OpenBSD__ || defined __APPLE__
+# include <sys/mman.h>
+#endif
+
+void makeasmwriteable(void)
+{
+#ifndef ENGINE_USING_A_C
+    extern int32_t dep_begin, dep_end;
+# if defined _WIN32
+    DWORD oldprot;
+    if (!VirtualProtect((LPVOID)&dep_begin, (SIZE_T)&dep_end - (SIZE_T)&dep_begin, PAGE_EXECUTE_READWRITE, &oldprot))
+    {
+        initprintf("Error making code writeable");
+        return;
+    }
+# elif defined __linux || defined __FreeBSD__ || defined __NetBSD__ || defined __OpenBSD__ || defined __APPLE__
+    int32_t pagesize;
+    size_t dep_begin_page;
+    pagesize = sysconf(_SC_PAGE_SIZE);
+    if (pagesize == -1)
+    {
+        initprintf("Error getting system page size\n");
+        return;
+    }
+    dep_begin_page = ((size_t)&dep_begin) & ~(pagesize-1);
+    if (mprotect((void *)dep_begin_page, (size_t)&dep_end - dep_begin_page, PROT_READ|PROT_WRITE) < 0)
+    {
+        initprintf("Error making code writeable (errno=%d)\n", errno);
+        return;
+    }
+# else
+#  error "Don't know how to unprotect the self-modifying assembly on this platform!"
+# endif
+#endif
+}
diff --git a/polymer/eduke32/build/src/defs.c b/polymer/eduke32/build/src/defs.c
index f877fcdc8..0674a096b 100644
--- a/polymer/eduke32/build/src/defs.c
+++ b/polymer/eduke32/build/src/defs.c
@@ -730,6 +730,8 @@ static int32_t defsparser(scriptfile *script)
                 break;
             }
             md_setmisc(lastmodelid,(float)scale, shadeoffs,0.0,0);
+            if (glrendmode==4)
+                md3postload_polymer((md3model_t *)models[lastmodelid]);
 #endif
             modelskin = lastmodelskin = 0;
             seenframe = 0;
@@ -764,8 +766,6 @@ static int32_t defsparser(scriptfile *script)
             {
                 switch (md_defineframe(lastmodelid, framename, tilex, max(0,modelskin), 0.0f,0))
                 {
-                case 0:
-                    break;
                 case -1:
                     happy = 0; break; // invalid model id!?
                 case -2:
@@ -778,6 +778,8 @@ static int32_t defsparser(scriptfile *script)
                                script->filename, scriptfile_getlinum(script,cmdtokptr));
                     happy = 0;
                     break;
+                default:
+                    break;
                 }
             }
 #endif
@@ -934,6 +936,9 @@ static int32_t defsparser(scriptfile *script)
             char *modelend, *modelfn;
             double scale=1.0, mzadd=0.0;
             int32_t shadeoffs=0, pal=0, flags=0;
+            uint8_t usedframebitmap[1024>>3];
+
+            Bmemset(usedframebitmap, 0, sizeof(usedframebitmap));
 
             static const tokenlist modeltokens[] =
             {
@@ -983,7 +988,7 @@ static int32_t defsparser(scriptfile *script)
                 {
                     char *frametokptr = script->ltextptr;
                     char *frameend, *framename = 0, happy=1;
-                    int32_t ftilenume = -1, ltilenume = -1, tilex = 0;
+                    int32_t ftilenume = -1, ltilenume = -1, tilex = 0, framei;
                     double smoothduration = 0.1f;
 
                     static const tokenlist modelframetokens[] =
@@ -1037,10 +1042,9 @@ static int32_t defsparser(scriptfile *script)
 #ifdef USE_OPENGL
                     for (tilex = ftilenume; tilex <= ltilenume && happy; tilex++)
                     {
-                        switch (md_defineframe(lastmodelid, framename, tilex, max(0,modelskin), smoothduration,pal))
+                        framei = md_defineframe(lastmodelid, framename, tilex, max(0,modelskin), smoothduration,pal);
+                        switch (framei)
                         {
-                        case 0:
-                            break;
                         case -1:
                             happy = 0; break; // invalid model id!?
                         case -2:
@@ -1053,6 +1057,9 @@ static int32_t defsparser(scriptfile *script)
                                        script->filename, scriptfile_getlinum(script,frametokptr));
                             happy = 0;
                             break;
+                        default:
+                            if (framei >= 0 && framei<1024)
+                                usedframebitmap[framei>>3] |= (1<<(framei&7));
                         }
                     }
 #endif
@@ -1312,6 +1319,24 @@ static int32_t defsparser(scriptfile *script)
 
 #ifdef USE_OPENGL
             md_setmisc(lastmodelid,(float)scale,shadeoffs,(float)mzadd,flags);
+
+            // thin out the loaded model by throwing away unused frames
+            if (models[lastmodelid]->mdnum==3 && ((md3model_t *)models[lastmodelid])->numframes <= 1024)
+            {
+                md3model_t *m = (md3model_t *)models[lastmodelid];
+                int32_t i, onumframes;
+                onumframes = m->numframes;
+                i = md_thinoutmodel(lastmodelid, usedframebitmap);
+#ifdef DEBUG_MODEL_MEM
+                if (i>=0 && i<onumframes)
+                    initprintf("used %d/%d frames: %s\n", i, onumframes, modelfn);
+                else if (i<0)
+                    initprintf("md_thinoutmodel returned %d: %s\n", i, modelfn);
+#endif
+            }
+
+            if (glrendmode==4)
+                md3postload_polymer((md3model_t *)models[lastmodelid]);
 #endif
 
             modelskin = lastmodelskin = 0;
diff --git a/polymer/eduke32/build/src/mdsprite.c b/polymer/eduke32/build/src/mdsprite.c
index d424627ff..92002bdb2 100644
--- a/polymer/eduke32/build/src/mdsprite.c
+++ b/polymer/eduke32/build/src/mdsprite.c
@@ -291,7 +291,7 @@ int32_t md_defineframe(int32_t modelid, const char *framename, int32_t tilenume,
     tile2model[tilenume].skinnum = skinnum;
     tile2model[tilenume].smoothduration = smoothduration;
 
-    return 0;
+    return i;
 }
 
 int32_t md_defineanimation(int32_t modelid, const char *framestart, const char *frameend, int32_t fpssc, int32_t flags)
@@ -331,6 +331,108 @@ int32_t md_defineanimation(int32_t modelid, const char *framestart, const char *
     return(0);
 }
 
+int32_t md_thinoutmodel(int32_t modelid, uint8_t *usedframebitmap)
+{
+    md3model_t *m;
+    md3surf_t *s;
+    mdanim_t *anm;
+    int32_t i, surfi, sub, usedframes;
+    static int16_t otonframe[1024];
+
+    if ((uint32_t)modelid >= (uint32_t)nextmodelid) return -1;
+    m = (md3model_t *)models[modelid];
+    if (m->mdnum != 3) return -2;
+
+    for (anm=m->animations; anm; anm=anm->next)
+    {
+        if (anm->endframe <= anm->startframe)
+        {
+//            initprintf("backward anim %d-%d\n", anm->startframe, anm->endframe);
+            return -3;
+        }
+
+        for (i=anm->startframe; i<anm->endframe; i++)
+            usedframebitmap[i>>3] |= (1<<(i&7));
+    }
+
+    sub = 0;
+    for (i=0; i<m->numframes; i++)
+    {
+        if (!(usedframebitmap[i>>3]&(1<<(i&7))))
+        {
+            sub++;
+            otonframe[i] = -1;
+            continue;
+        }
+
+        otonframe[i] = i-sub;
+    }
+
+    usedframes = m->numframes - sub;
+    if (usedframes==0 || usedframes==m->numframes)
+        return usedframes;
+
+    //// THIN OUT! ////
+
+    for (i=0; i<m->numframes; i++)
+    {
+        if (otonframe[i]>=0 && otonframe[i] != i)
+        {
+            if (m->muladdframes)
+                Bmemcpy(&m->muladdframes[2*otonframe[i]], &m->muladdframes[2*i], 2*sizeof(point3d));
+            Bmemcpy(&m->head.frames[otonframe[i]], &m->head.frames[i], sizeof(md3frame_t));
+        }
+    }
+
+    for (surfi=0; surfi < m->head.numsurfs; surfi++)
+    {
+        s = &m->head.surfs[surfi];
+
+        for (i=0; i<m->numframes; i++)
+            if (otonframe[i]>=0 && otonframe[i] != i)
+                Bmemcpy(&s->xyzn[otonframe[i]*s->numverts], &s->xyzn[i*s->numverts], s->numverts*sizeof(md3xyzn_t));
+    }
+
+    ////// tweak frame indices in various places
+
+    for (anm=m->animations; anm; anm=anm->next)
+    {
+        if (otonframe[anm->startframe]==-1 || otonframe[anm->endframe-1]==-1)
+            initprintf("md %d WTF: anm %d %d\n", modelid, anm->startframe, anm->endframe);
+
+        anm->startframe = otonframe[anm->startframe];
+        anm->endframe = otonframe[anm->endframe-1];
+    }
+
+    for (i=0; i<MAXTILES+EXTRATILES; i++)
+        if (tile2model[i].modelid == modelid)
+        {
+            if (otonframe[tile2model[i].framenum]==-1)
+                initprintf("md %d WTF: tile %d, fr %d\n", modelid, i, tile2model[i].framenum);
+            tile2model[i].framenum = otonframe[tile2model[i].framenum];
+        }
+
+    ////// realloc & change "numframes" everywhere
+    // TODO: check if NULL
+
+    if (m->muladdframes)
+        m->muladdframes = Brealloc(m->muladdframes, 2*sizeof(point3d)*usedframes);
+    m->head.frames = Brealloc(m->head.frames, sizeof(md3frame_t)*usedframes);
+
+    for (surfi=0; surfi < m->head.numsurfs; surfi++)
+    {
+        m->head.surfs[surfi].numframes = usedframes;
+        // CAN'T do that because xyzn is offset from a larger block when loaded from md3:
+//        m->head.surfs[surfi].xyzn = Brealloc(m->head.surfs[surfi].xyzn, s->numverts*usedframes*sizeof(md3xyzn_t));
+    }
+
+    m->head.numframes = usedframes;
+    m->numframes = usedframes;
+
+    ////////////
+    return usedframes;
+}
+
 int32_t md_defineskin(int32_t modelid, const char *skinfn, int32_t palnum, int32_t skinnum, int32_t surfnum, float param, float specpower, float specfactor)
 {
     mdskinmap_t *sk, *skl;
@@ -1685,13 +1787,23 @@ int      md3postload_polymer(md3model_t *m)
     int         *numtris;
     float       lat, lng, vec1[5], vec2[5], mat[9], r;
 
+    if (m->head.surfs[0].geometry)
+        return -1;  // already postprocessed
+
     // let's also repack the geometry to more usable formats
 
     surfi = 0;
     while (surfi < m->head.numsurfs)
     {
         s = &m->head.surfs[surfi];
-
+#ifdef DEBUG_MODEL_MEM
+        i = (m->head.numframes * s->numverts * sizeof(float) * 15);
+        if (i > 1<<20)
+            initprintf("size %d (%d fr, %d v): md %s surf %d/%d\n", i, m->head.numframes, s->numverts,
+                       m->indices?(char *)m->indices:"null", surfi, m->head.numsurfs);
+        if (m->indices)
+            Bfree(m->indices), m->indices=NULL;
+#endif
         s->geometry = Bcalloc(m->head.numframes * s->numverts * sizeof(float), 15);
 
         numtris = Bcalloc(s->numverts, sizeof(int));
@@ -3249,19 +3361,18 @@ mdmodel_t *mdload(const char *filnam)
 
     if (vm)
     {
+#ifdef DEBUG_MODEL_MEM
+        ((md3model_t *)vm)->indices = (void *)Bstrdup(filnam);
+#endif
         md3postload_common((md3model_t *)vm);
-#ifdef POLYMER
-// implies defined(POLYMOST) && defined(USE_OPENGL)?
-        if (glrendmode==4)
-            i = md3postload_polymer((md3model_t *)vm);
-        else
-            i = md3postload_polymer_check((md3model_t *)vm);
 
-        if (!i)
-        {
-            mdfree(vm);
-            vm = (mdmodel_t *)0;
-        }
+#ifdef POLYMER
+        if (glrendmode!=4)
+            if (!md3postload_polymer_check((md3model_t *)vm))
+            {
+                mdfree(vm);
+                vm = (mdmodel_t *)0;
+            }
 #endif
     }
 
diff --git a/polymer/eduke32/build/src/osd.c b/polymer/eduke32/build/src/osd.c
index b8f8571ac..08f85cd9b 100644
--- a/polymer/eduke32/build/src/osd.c
+++ b/polymer/eduke32/build/src/osd.c
@@ -252,12 +252,16 @@ int32_t OSD_Exec(const char *szScript)
 
     if (fp != NULL)
     {
-        char line[255];
+        char line[256], *cp;
 
         OSD_Printf("Executing \"%s\"\n", szScript);
         osdexecscript++;
-        while (fgets(line, sizeof(line)-1, fp) != NULL)
-            OSD_Dispatch(strtok(line,"\r\n"));
+        while (fgets(line, sizeof(line), fp) != NULL)
+        {
+            cp = strtok(line,"\r\n");
+            if (cp)
+                OSD_Dispatch(cp);
+        }
         osdexecscript--;
         fclose(fp);
         return 0;
diff --git a/polymer/eduke32/build/src/sdlayer.c b/polymer/eduke32/build/src/sdlayer.c
index 5e906a197..2fa16092b 100644
--- a/polymer/eduke32/build/src/sdlayer.c
+++ b/polymer/eduke32/build/src/sdlayer.c
@@ -2163,41 +2163,3 @@ static int32_t buildkeytranslationtable(void)
     return 0;
 }
 #endif
-#if defined _WIN32
-# define WIN32_LEAN_AND_MEAN
-# include <windows.h>
-#elif defined __linux || defined __FreeBSD__ || defined __NetBSD__ || defined __OpenBSD__ || defined __APPLE__
-# include <sys/mman.h>
-#endif
-
-void makeasmwriteable(void)
-{
-#ifndef ENGINE_USING_A_C
-    extern int32_t dep_begin, dep_end;
-# if defined _WIN32
-    DWORD oldprot;
-    if (!VirtualProtect((LPVOID)&dep_begin, (SIZE_T)&dep_end - (SIZE_T)&dep_begin, PAGE_EXECUTE_READWRITE, &oldprot))
-    {
-        initprint("Error making code writeable\n");
-        return;
-    }
-# elif defined __linux || defined __FreeBSD__ || defined __NetBSD__ || defined __OpenBSD__ || defined __APPLE__
-    int32_t pagesize;
-    size_t dep_begin_page;
-    pagesize = sysconf(_SC_PAGE_SIZE);
-    if (pagesize == -1)
-    {
-        initprintf("Error getting system page size\n");
-        return;
-    }
-    dep_begin_page = ((size_t)&dep_begin) & ~(pagesize-1);
-    if (mprotect((void *)dep_begin_page, (size_t)&dep_end - dep_begin_page, PROT_READ|PROT_WRITE) < 0)
-    {
-        initprintf("Error making code writeable (errno=%d)\n", errno);
-        return;
-    }
-# else
-#  error "Don't know how to unprotect the self-modifying assembly on this platform!"
-# endif
-#endif
-}
diff --git a/polymer/eduke32/build/src/winlayer.c b/polymer/eduke32/build/src/winlayer.c
index 9fd858b79..9e15d85b7 100644
--- a/polymer/eduke32/build/src/winlayer.c
+++ b/polymer/eduke32/build/src/winlayer.c
@@ -3771,20 +3771,3 @@ static LPTSTR GetWindowsErrorMsg(DWORD code)
 
     return lpMsgBuf;
 }
-
-//
-// makeasmwriteable() -- removes write protection from the self-modifying assembly code
-//
-void makeasmwriteable(void)
-{
-#ifndef ENGINE_USING_A_C
-    extern int32_t dep_begin, dep_end;
-    DWORD oldprot;
-
-    if (!VirtualProtect((LPVOID)&dep_begin, (SIZE_T)&dep_end - (SIZE_T)&dep_begin, PAGE_EXECUTE_READWRITE, &oldprot))
-    {
-        ShowErrorBox("Problem making code writeable");
-    }
-#endif
-}
-
diff --git a/polymer/eduke32/source/config.c b/polymer/eduke32/source/config.c
index b545f4e95..7d7b36d33 100644
--- a/polymer/eduke32/source/config.c
+++ b/polymer/eduke32/source/config.c
@@ -648,6 +648,8 @@ int32_t CONFIG_ReadSetup(void)
             SCRIPT_GetString(ud.config.scripthandle, "Comm Setup",commmacro,&ud.ridecule[dummy][0]);
         }
 
+        Bmemset(tempbuf, 0, sizeof(tempbuf));
+//        Bmemset(dummybuf, 0, sizeof(dummybuf));
         SCRIPT_GetString(ud.config.scripthandle, "Comm Setup","PlayerName",&tempbuf[0]);
 
         while (Bstrlen(OSD_StripColors(dummybuf,tempbuf)) > 10)
diff --git a/polymer/eduke32/source/savegame.c b/polymer/eduke32/source/savegame.c
index 291df59cd..d3e7f68e0 100644
--- a/polymer/eduke32/source/savegame.c
+++ b/polymer/eduke32/source/savegame.c
@@ -613,22 +613,16 @@ int32_t G_LoadPlayer(int32_t spot)
 
 #ifdef POLYMER
     if (getrendermode() == 4)
-    {
-        int32_t i = 0;
-
         polymer_loadboard();
-
-        while (i < MAXSPRITES)
-        {
-            if (actor[i].lightptr)
-            {
-                actor[i].lightptr = NULL;
-                actor[i].lightId = -1;
-            }
-            i++;
-        }
-    }
 #endif
+    // this light pointer nulling needs to be outside the getrendermode check
+    // because we might be loading the savegame using another renderer but
+    // change to Polymer later
+    for (i=0; i<MAXSPRITES; i++)
+    {
+        actor[i].lightptr = NULL;
+        actor[i].lightId = -1;
+    }
 
     return(0);
 corrupt:
@@ -1930,8 +1924,8 @@ static void sv_preactordatasave()
     Bmemset(savegame_bitmap, 0, sizeof(savegame_bitmap));
     for (i=0; i<MAXSPRITES; i++)
     {
-//        Actor[i].lightptr = NULL;
-//        Actor[i].lightId = -1;
+        actor[i].lightptr = NULL;
+        actor[i].lightId = -1;
 
         if (sprite[i].statnum==MAXSTATUS || actorscrptr[PN]==NULL) continue;
         if (T2 >= j && T2 < k) savegame_bitmap[i>>3][0] |= 1<<(i&7), T2 -= j;
@@ -1951,8 +1945,9 @@ static void sv_postactordata()
 
     for (i=0; i<MAXSPRITES; i++)
     {
-//        Actor[i].lightptr = NULL;
-//        Actor[i].lightId = -1;
+        actor[i].lightptr = NULL;
+        actor[i].lightId = -1;
+
         actor[i].projectile = &SpriteProjectile[i];
 
         if (sprite[i].statnum==MAXSTATUS || actorscrptr[PN]==NULL) continue;