diff --git a/zsnes/src/cpu/execute.asm b/zsnes/src/cpu/execute.asm
index c2783ca8..0e18b771 100644
--- a/zsnes/src/cpu/execute.asm
+++ b/zsnes/src/cpu/execute.asm
@@ -4196,6 +4196,7 @@ NEWSYM UpdateCLSR
    test byte[SfxCLSR],01h
    jz .nohighsfx
    mov dword [NumberOfOpcodes2],700 ;700
+int 3h
 .nohighsfx
     cmp byte[SFXCounter],1
     je .noyi
@@ -4228,6 +4229,10 @@ NEWSYM StartSFX
     jz .noaccess
 .noram
     mov eax,[NumberOfOpcodes2]
+    test byte[SfxCLSR],0
+    jnz .nofastsfx
+    add eax,500000
+.nofastsfx
     mov [NumberOfOpcodes],eax
     call MainLoop
 .noaccess