[Tracking Requested - why for this release]: [Tracking Requested - why for this release]: Steps To Reproduce: 1. Open http://www.bing.com/maps/ 2. Click [-] icon in the map continuously(approx 0.5-1sec interval) until minimum zoom 3. Click [+] icon in the map continuously(approx 0.5-1sec interval) until maximum zoom (The interval may depend on CPU/Network speed(CPU@2.5GHz/8MADSL)) Actual Results: choppy Expected Results: Smooth Regression window(m-c) Good: https://hg.mozilla.org/mozilla-central/rev/31c5d0a5115d Mozilla/5.0 (Windows NT 6.1; WOW64; rv:33.0) Gecko/20100101 Firefox/33.0 ID:20140715053734 Bad: https://hg.mozilla.org/mozilla-central/rev/d2d56f9066bf Mozilla/5.0 (Windows NT 6.1; WOW64; rv:33.0) Gecko/20100101 Firefox/33.0 ID:20140715055935 Pushlog: http://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=31c5d0a5115d&tochange=d2d56f9066bf Regression window(m-i) Good: https://hg.mozilla.org/integration/mozilla-inbound/rev/a60905d4dfd8 Mozilla/5.0 (Windows NT 6.1; WOW64; rv:33.0) Gecko/20100101 Firefox/33.0 ID:20140714163736 Bad: https://hg.mozilla.org/integration/mozilla-inbound/rev/1aa504e62034 Mozilla/5.0 (Windows NT 6.1; WOW64; rv:33.0) Gecko/20100101 Firefox/33.0 ID:20140714180536 Pushlog: http://hg.mozilla.org/integration/mozilla-inbound/pushloghtml?fromchange=a60905d4dfd8&tochange=1aa504e62034 Triggered by: 1aa504e62034 Matt Woodrow — Bug 1034247 - Avoid propogating scale factors down to ThebesLayers if it would result in them being larger than the max texture size. r=roc

Matt, can you help here? Thanks

Performance regression on a major website. Tracking!

Removing this meant that we started pre-rendering the transition effects on bing maps. It still wasn't over the texture size limit, so we go ahead with it and render enormous textures, which is slow. Reverting this seems the safest things to do for now (and doesn't invalidate the original crash fix). We still need to figure out better prerender/scale propagation heuristics, but this bug isn't the right place.

Matt, can we have an uplift request for 33 (aurora)? Thanks

Comment on attachment 8470579 [details] [diff] [review] Revert the pre-render conditions Approval Request Comment [Feature/regressing bug #]: Bug 1034247 [User impact if declined]: Poor performance on bing maps [Describe test coverage new/current, TBPL]: Tested manually. [Risks and why]: Super low risk, just reverting to previous behaviour. [String/UUID change made/needed]: None

Reproduced the issue on old Nightly (2014-08-06), verified that the issue is fixed (zooming in bing maps is smooth) on Windows 7 64bit using latest Aurora and Firefox 33 beta 2.