diff --git a/CompilePalX/Compilers/CompileExecutable.cs b/CompilePalX/Compilers/CompileExecutable.cs
index 2d80bbf6..0ab7a787 100644
--- a/CompilePalX/Compilers/CompileExecutable.cs
+++ b/CompilePalX/Compilers/CompileExecutable.cs
@@ -47,6 +47,15 @@ public override void Run(CompileContext c)
             Process.Start();
             Process.PriorityClass = ProcessPriorityClass.BelowNormal;
 
+            //VRAD can only use up to 16 cores, more cores reduces performance, and increased compile time.
+            //By assigning affinity to the process significantly speed up compiles on CPUs with more than 16 cores.
+            if (this.Name == "VRAD" &&
+                Environment.ProcessorCount > 16)
+            {
+                //Hex 0xffff means core use core 0 through 15.
+                Process.ProcessorAffinity = (IntPtr)0xffff;
+            }
+            
             if (Metadata.ReadOutput)
                 readOutput();
         }