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#14682 closed bug (fixed)

Opened October 07, 2015 04:06AM UTC

Closed October 17, 2015 08:15PM UTC

High CPU Usage on chrome/mac because of tooltips

Reported by: mani902 Owned by:
Priority: minor Milestone: none
Component: ui.tooltip Version: 1.11.3
Keywords: Cc:
Blocked by: Blocking:

As part of implementing jQuery UI Tooltip library for our case, we noticed a very significant increase in CPU usage on chrome on mac. Using the chrome profiling tools, we found out

// Handle tracking tooltips that are shown with a delay (#8644). As soon
		// as the tooltip is visible, position the tooltip using the most recent
		// event.
		if ( && ) {
			delayedShow = setInterval(function() {
				if ( ":visible" ) ) {
					position( positionOption.of );
					clearInterval( delayedShow );
			}, $.fx.interval );

piece of code is setting timers and it increased the CPU usage by 40-50 % on some machines.

Looking at the original ticket, this was related to handle the tracking tooltips with delay option.

However, there is no check for the track option before setting the timer, and we are not using track=true tooltips in our case, only delay. So unknowingly using delay is causing a huge amount of cpu usage.

First fix is to add the check for the track option also, so that unless someone is not using both track and delay option, timers should not be set.

Second will be to identify why the cpu usage increases so much on mac/chrome combination.

Attachments (0)
Change History (1)

Changed October 17, 2015 08:15PM UTC by Mani Mishra comment:1

resolution: → fixed
status: newclosed

Tooltip: Use show.delay update only when track option is active

Fixes #14682

Closes gh-1613

Changeset: d5732327078709c3680385c79a2106f263009f84