diff --git a/source/blood/src/blood.cpp b/source/blood/src/blood.cpp
index 862b386e3..8f4c59ac8 100644
--- a/source/blood/src/blood.cpp
+++ b/source/blood/src/blood.cpp
@@ -808,9 +808,12 @@ void ProcessFrame(void)
         gPlayer[i].input.q16mlook = gFifoInput[gNetFifoTail&255][i].q16mlook;
     }
     gNetFifoTail++;
-    CalcGameChecksum();
-    memcpy(gCheckFifo[gCheckHead[myconnectindex]&255][myconnectindex], gChecksum, sizeof(gChecksum));
-    gCheckHead[myconnectindex]++;
+    if (!(gFrame&7))
+    {
+        CalcGameChecksum();
+        memcpy(gCheckFifo[gCheckHead[myconnectindex]&255][myconnectindex], gChecksum, sizeof(gChecksum));
+        gCheckHead[myconnectindex]++;
+    }
     for (int i = connecthead; i >= 0; i = connectpoint2[i])
     {
         if (gPlayer[i].input.keyFlags.quit)