i’ve found the single most important piece of advice in this field is, “when you can not be very sure that the code called by setInterval(f,dt0) will finish in clearly less than dt0 milliseconds, consider to use setTimeout(f,dt1) instead (from within f itself to keep the process running)”. this will give at least dt1 milliseconds to your other browser processes to execute so a freeze becomes less likely. you may want to check elapsed time before calling setTimeout from within f so you can add more delay in case execution was swift.