From cd0956b21946ed3cf5f50d06ec70a56bd01db59b Mon Sep 17 00:00:00 2001
From: Matthew Stratford <hi@mstratford.net>
Date: Sun, 24 Jan 2021 00:56:13 +0000
Subject: [PATCH] Limit FPS of VU meters to help weedy CPUs.

---
 src/optionsMenu/helpers/VUMeter.tsx | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/optionsMenu/helpers/VUMeter.tsx b/src/optionsMenu/helpers/VUMeter.tsx
index 97c07d1..0e7791b 100644
--- a/src/optionsMenu/helpers/VUMeter.tsx
+++ b/src/optionsMenu/helpers/VUMeter.tsx
@@ -27,6 +27,8 @@ export function VUMeter(props: VUMeterProps) {
 
   const isMic = props.source.substr(0, 3) === "mic";
 
+  const FPS = 30; // Limit the FPS so that lower spec machines have a better time juggling CPU.
+
   useEffect(() => {
     const animate = () => {
       if (!isMic || isMicOpen) {
@@ -38,7 +40,9 @@ export function VUMeter(props: VUMeterProps) {
         if (props.stereo) {
           setPeakR(result[1]);
         }
-        rafRef.current = requestAnimationFrame(animate);
+        setTimeout((current = rafRef.current, a = animate) => {
+          current = requestAnimationFrame(a);
+        }, 1000 / FPS);
       }
     };
     if (!isMic || isMicOpen) {