Elevate priorities for the UDP relay threads

miss/miss.cpp

@@ -868,6 +868,10 @@ int Run()
 
     ResetLogFile();
 
+    // Bump the process priority class to above normal. The UDP relay threads will
+    // further raise their own thread priorities to avoid preemption by other activity.
+    SetPriorityClass(GetCurrentProcess(), ABOVE_NORMAL_PRIORITY_CLASS);
+
     // Create the UDP alternate port relays
     for (int i = 0; i < ARRAYSIZE(k_Ports); i++) {
         if (k_Ports[i].proto == IPPROTO_UDP) {

miss/relay.cpp

@@ -21,6 +21,9 @@ UdpRelayThreadProc(LPVOID Context)
     PUDP_TUPLE tuple = (PUDP_TUPLE)Context;
     SOCKADDR_IN lastRemoteAddr;
 
+    // Ensure the relay threads aren't preempted by games or other CPU intensive activity
+    SetThreadPriority(GetCurrentThread(), THREAD_PRIORITY_HIGHEST);
+
     RtlZeroMemory(&lastRemoteAddr, sizeof(lastRemoteAddr));
 
     for (;;) {