Add comment describing the disable

Author: CompuIves

packages/common/src/utils/debug.ts

@@ -26,6 +26,8 @@ const getDebugger: () => (key: string) => (...message: any[]) => void = () => {
     const global = getGlobal() as any;
     // Return a debugger that will log to sentry
     return (key: string) => (message: string) => {
+      // Disable it for now, seems to affect performance. That's the last thing we want
+      // from this (https://github.com/CompuIves/codesandbox-client/issues/1671)
       if (false || typeof global.Raven === 'object') {
         try {
           global.Raven.captureBreadcrumb({