User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:16.0) Gecko/20100101 Firefox/16.0 (This was done with a fresh profile and no add-ons installed) Steps to reproduce: 1. Load the following page: https://maps.google.com/?ie=UTF8&ll=49.759688,-85.184921&spn=0.021541,0.066047&t=v&z=15&vpsrc=6 2. Activate "MapsGL" if it isn't already. 3. Now, go onto StreetView on the only road there that has it. 4. Center StreetView on the road's center line (doesn't matter which direction) 5. Start traveling in StreetView down Ontario 11 in jumps (don't use the arrows to follow the route, use the circle that shows up when you point your cursor into the distance on the image). 6. After 5 or 6 of the jumps down the map, start up the Task Manager and notice that firefox.exe is using over 1MB of memory. Doing the steps above, I was able to once get firefox.exe over 2MB of memory used.

1 MB or 1 GB? Could you post the memory log of about:memory?verbose, please.

That's what I get for typing and not paying attention. :facepalm: Yes, 1GB/2GB. I'll do the about:memory next as I need to restart and use the new profile to do it.

Main Process Explicit Allocations 412.44 MB (100.0%) -- explicit ├──271.79 MB (65.90%) -- images │ ├──271.33 MB (65.79%) -- content │ │ ├──270.86 MB (65.67%) -- used │ │ │ ├──249.16 MB (60.41%) ── uncompressed-heap │ │ │ ├───21.70 MB (05.26%) ── raw │ │ │ └────0.00 MB (00.00%) ── uncompressed-nonheap │ │ └────0.48 MB (00.12%) ++ unused │ └────0.46 MB (00.11%) ++ chrome ├───61.43 MB (14.89%) -- js-non-window │ ├──38.18 MB (09.26%) -- compartments │ │ ├──22.52 MB (05.46%) -- no-global │ │ │ ├──22.51 MB (05.46%) -- compartment(atoms) │ │ │ │ ├──21.66 MB (05.25%) ── string-chars │ │ │ │ └───0.86 MB (00.21%) ++ (2 tiny) │ │ │ └───0.01 MB (00.00%) ── compartment([System Principal], about:newtab)/other-sundries [2] │ │ └──15.66 MB (03.80%) ++ non-window-global │ ├──21.77 MB (05.28%) -- gc-heap │ │ ├──20.77 MB (05.04%) ── decommitted-arenas │ │ └───1.00 MB (00.24%) ++ (3 tiny) │ └───1.47 MB (00.36%) ++ runtime ├───54.79 MB (13.28%) -- window-objects │ ├──47.83 MB (11.60%) -- top(https://maps.google.com/?ie=UTF8&ll=49.759688,-85.184921&spn=0.021541,0.066047&t=v&z=15&vpsrc=6, id=7) │ │ ├──47.24 MB (11.45%) -- active │ │ │ ├──46.55 MB (11.29%) -- window(https://maps.google.com/?ie=UTF8&ll=49.759688,-85.184921&spn=0.021541,0.066047&t=v&z=15&vpsrc=6) │ │ │ │ ├──44.20 MB (10.72%) -- js/compartment(https://maps.google.com/?ie=UTF8&ll=49.759688,-85.184921&spn=0.021541,0.066047&t=v&z=15&vpsrc=6) │ │ │ │ │ ├──29.58 MB (07.17%) -- gc-heap │ │ │ │ │ │ ├──18.29 MB (04.44%) ── unused-gc-things │ │ │ │ │ │ ├───8.09 MB (01.96%) -- objects │ │ │ │ │ │ │ ├──7.19 MB (01.74%) ── non-function │ │ │ │ │ │ │ └──0.90 MB (00.22%) ── function │ │ │ │ │ │ └───3.19 MB (00.77%) ++ (5 tiny) │ │ │ │ │ ├───9.20 MB (02.23%) -- objects │ │ │ │ │ │ ├──6.81 MB (01.65%) ── elements │ │ │ │ │ │ └──2.39 MB (00.58%) ── slots │ │ │ │ │ └───5.42 MB (01.31%) ++ (6 tiny) │ │ │ │ └───2.35 MB (00.57%) ++ (4 tiny) │ │ │ └───0.69 MB (00.17%) ++ (2 tiny) │ │ └───0.59 MB (00.14%) ++ cached/window(about:home) │ └───6.95 MB (01.69%) ++ (4 tiny) ├───15.42 MB (03.74%) ── heap-unclassified ├────5.06 MB (01.23%) -- storage │ ├──5.06 MB (01.23%) ++ sqlite │ └──0.00 MB (00.00%) ── prefixset/all └────3.96 MB (00.96%) ++ (11 tiny) Other Measurements 169 (100.0%) -- js-compartments ├──162 (95.86%) ── system └────7 (04.14%) ── user 109.61 MB (100.0%) -- js-main-runtime ├───86.37 MB (78.80%) -- compartments │ ├──42.23 MB (38.53%) -- gc-heap │ │ ├──25.22 MB (23.01%) ── unused-gc-things │ │ ├──10.01 MB (09.13%) -- objects │ │ │ ├───7.91 MB (07.21%) ── non-function │ │ │ └───2.10 MB (01.92%) ── function │ │ ├───3.77 MB (03.44%) -- shapes │ │ │ ├──1.68 MB (01.53%) ── tree │ │ │ ├──1.25 MB (01.14%) ── dict │ │ │ └──0.84 MB (00.77%) ── base │ │ ├───1.66 MB (01.52%) ++ (4 tiny) │ │ └───1.58 MB (01.44%) ── scripts │ ├──22.19 MB (20.25%) ── string-chars │ ├───9.96 MB (09.08%) -- objects │ │ ├──6.82 MB (06.22%) ── elements │ │ ├──3.11 MB (02.84%) ── slots │ │ └──0.02 MB (00.02%) ── misc │ ├───5.08 MB (04.63%) ── script-data │ ├───3.15 MB (02.88%) ── analysis-temporary │ ├───2.89 MB (02.63%) -- shapes-extra │ │ ├──1.62 MB (01.48%) ++ (3 tiny) │ │ └──1.26 MB (01.15%) ── dict-tables │ └───0.87 MB (00.80%) ++ (3 tiny) ├───21.77 MB (19.86%) -- gc-heap │ ├──20.77 MB (18.95%) ── decommitted-arenas │ └───1.00 MB (00.91%) ++ (3 tiny) └────1.47 MB (01.34%) ── runtime 43.23 MB (100.0%) -- js-main-runtime-gc-heap-committed ├──25.22 MB (58.33%) -- unused │ ├──25.22 MB (58.33%) ── gc-things │ └───0.00 MB (00.00%) ++ (2 tiny) └──18.01 MB (41.67%) -- used ├──16.73 MB (38.70%) ── gc-things ├───1.00 MB (02.31%) ── chunk-admin └───0.28 MB (00.65%) ── arena-admin 0 (100.0%) -- low-memory-events ├──0 (100.0%) ── physical └──0 (100.0%) ── virtual 6.60 MB (100.0%) -- window-objects ├──2.80 MB (42.47%) -- dom │ ├──1.86 MB (28.23%) ── orphan-nodes │ ├──0.44 MB (06.68%) ── element-nodes │ ├──0.32 MB (04.85%) ── text-nodes │ ├──0.18 MB (02.68%) ── other │ └──0.00 MB (00.02%) ++ (2 tiny) ├──2.56 MB (38.80%) -- layout │ ├──1.24 MB (18.71%) ── style-sets │ ├──0.67 MB (10.19%) ── pres-shell │ ├──0.31 MB (04.71%) ── frames │ ├──0.13 MB (01.95%) ── style-contexts │ ├──0.13 MB (01.91%) ── rule-nodes │ └──0.09 MB (01.33%) ++ (3 tiny) ├──1.23 MB (18.67%) ── style-sheets └──0.00 MB (00.06%) ── property-tables 11.31 MB ── canvas-2d-pixel-bytes [2] 412.45 MB ── explicit 0.25 MB ── gfx-d2d-surfacecache 13.31 MB ── gfx-d2d-surfacevram 27.69 MB ── gfx-d2d-vram-drawtarget 0.75 MB ── gfx-d2d-vram-sourcesurface 251.63 MB ── gfx-surface-image 0 ── ghost-windows 347.32 MB ── heap-allocated 366.45 MB ── heap-committed 19.12 MB ── heap-committed-unused 5.50% ── heap-committed-unused-ratio 2.31 MB ── heap-dirty 82.68 MB ── heap-unused 249.16 MB ── images-content-used-uncompressed 64.00 MB ── js-gc-heap 0 ── low-commit-space-events 683.22 MB ── private 710.61 MB ── resident 5.06 MB ── storage-sqlite 1,125.70 MB ── vsize 1,424 ── webgl-buffer-count 0.60 MB ── webgl-buffer-memory 2 ── webgl-context-count 1 ── webgl-renderbuffer-count 5.13 MB ── webgl-renderbuffer-memory 28 ── webgl-shader-count 1,877 ── webgl-texture-count 126.68 MB ── webgl-texture-memory

Now the really weird thing is that when I switched tabs to get the "about:memory", the memory usage of FF dropped down to around 600MB. But if I switched back to the tab with Google Maps in it, the memory usage jumped back up to ~1.5GB. That kept happening every time I switched tabs trying to get an accurate memory reading in about:memory. Never seen that happen before.

This is almost certainly due to images, because * The memory jumps up to 600mb when you switch back to the tab (at which point we'll decode all the images on the tab) and jumps down when you leave the tab (at which point we discard many of the tab's images). * In the about:memory dump above, you're using very nearly 250mb of images │ │ │ ├──249.16 MB (60.41%) ── uncompressed-heap 250mb is the default maximum amount of decoded image data we'll willingly keep around. Sometimes we're forced to keep around more than that, but you're seeing here us hitting our max. It's not entirely clear what Google is doing to cause us to have hundreds of mb of decoded images in the DOM, but we should wait and see if bug 689623 has an effect here.

(In reply to Justin Lebar [:jlebar] from comment #5) > This is almost certainly due to images, because > > * The memory jumps up to 600mb when you switch back to the tab (at which > point we'll decode all the images on the tab) and jumps down when you leave > the tab (at which point we discard many of the tab's images). > No, the memory doesn't jump up to 600mb, it goes down after I switch from the Google tab. When the Google Maps tab was in focus, the memory usage was around 1.5gb. However, when I switched to the tab that had the about:memory in it (without closing the Google one), the memory went down to the 600mb. I did happen to notice this at the bottom of my memory report above: 1,125.70 MB ── vsize Seems all the images that Google loaded are really being stored in that as I can't get a good accurate about:memory with the Google tab in focus.

> 1,125.70 MB ── vsize This isn't relevant; it's virtual memory which doesn't take up space in RAM. > When the Google Maps tab was in focus, the memory usage was around 1.5gb. However, when > I switched to the tab that had the about:memory in it (without closing the Google one), > the memory went down to the 600mb. Okay, this is entirely consistent with images being the problem. If you want to see this in action in about:memory, open a new browser window and load about:memory in there.

Mozilla/5.0 (Windows NT 6.2; WOW64; rv:16.0) Gecko/20100101 Firefox/16.0 I can confirm that this is also happening on Win 8-64 bit with Firefox 16 beta 5. Used memory increased to 1,198.5MB.

The content of my about:memory page is: Main Process Explicit Allocations 799.17 MB (100.0%) -- explicit ├──516.59 MB (64.64%) -- images │ ├──516.27 MB (64.60%) -- content │ │ ├──516.27 MB (64.60%) -- used │ │ │ ├──498.59 MB (62.39%) ── uncompressed-heap │ │ │ ├───17.68 MB (02.21%) ── raw │ │ │ └────0.00 MB (00.00%) ── uncompressed-nonheap │ │ └────0.00 MB (00.00%) ++ unused │ └────0.32 MB (00.04%) ++ chrome ├──147.31 MB (18.43%) -- window-objects │ ├──127.43 MB (15.94%) -- top(https://maps.google.com/maps?vector=1, id=8) │ │ ├──126.94 MB (15.88%) -- active │ │ │ ├──123.83 MB (15.49%) -- window(https://maps.google.com/maps?vector=1) │ │ │ │ ├──120.94 MB (15.13%) -- js │ │ │ │ │ ├──120.72 MB (15.11%) -- compartment(https://maps.google.com/maps?vector=1) │ │ │ │ │ │ ├───56.88 MB (07.12%) -- gc-heap │ │ │ │ │ │ │ ├──25.99 MB (03.25%) ── unused-gc-things [2] │ │ │ │ │ │ │ ├──22.77 MB (02.85%) -- objects │ │ │ │ │ │ │ │ ├──21.14 MB (02.65%) ── non-function [2] │ │ │ │ │ │ │ │ └───1.62 MB (00.20%) ── function [2] │ │ │ │ │ │ │ └───8.12 MB (01.02%) ++ (5 tiny) │ │ │ │ │ │ ├───40.93 MB (05.12%) -- objects │ │ │ │ │ │ │ ├──36.54 MB (04.57%) ── elements [2] │ │ │ │ │ │ │ └───4.40 MB (00.55%) ++ (2 tiny) │ │ │ │ │ │ ├───14.02 MB (01.75%) ++ (7 tiny) │ │ │ │ │ │ └────8.89 MB (01.11%) ── analysis-temporary [2] │ │ │ │ │ └────0.22 MB (00.03%) ++ compartment(https://maps.google.com/maps?vector=1, about:blank) │ │ │ │ └────2.89 MB (00.36%) ++ (4 tiny) │ │ │ └────3.12 MB (00.39%) ++ (4 tiny) │ │ └────0.48 MB (00.06%) ++ cached/window([system]) │ └───19.88 MB (02.49%) ++ (8 tiny) ├───71.04 MB (08.89%) -- js-non-window │ ├──48.92 MB (06.12%) -- compartments │ │ ├──33.37 MB (04.18%) ++ non-window-global │ │ └──15.55 MB (01.95%) -- no-global/compartment(atoms) │ │ ├──14.34 MB (01.79%) ── string-chars │ │ └───1.21 MB (00.15%) ++ (2 tiny) │ ├──16.10 MB (02.01%) -- gc-heap │ │ ├──14.49 MB (01.81%) ── decommitted-arenas │ │ └───1.61 MB (00.20%) ++ (3 tiny) │ └───6.02 MB (00.75%) ++ runtime ├───50.56 MB (06.33%) ── heap-unclassified └───13.67 MB (01.71%) ++ (13 tiny) Other Measurements 313 (100.0%) -- js-compartments ├──299 (95.53%) ── system └───14 (04.47%) ── user 210.07 MB (100.0%) -- js-main-runtime ├──187.95 MB (89.47%) -- compartments │ ├───86.90 MB (41.37%) -- gc-heap │ │ ├──39.94 MB (19.01%) ── unused-gc-things │ │ ├──30.11 MB (14.33%) -- objects │ │ │ ├──25.38 MB (12.08%) ── non-function │ │ │ └───4.73 MB (02.25%) ── function │ │ ├───7.91 MB (03.77%) -- shapes │ │ │ ├──3.69 MB (01.76%) ── tree │ │ │ ├──2.51 MB (01.20%) ── dict │ │ │ └──1.71 MB (00.81%) ── base │ │ ├───4.13 MB (01.97%) ── strings │ │ ├───3.30 MB (01.57%) ── scripts │ │ └───1.51 MB (00.72%) ++ (3 tiny) │ ├───42.79 MB (20.37%) -- objects │ │ ├──36.67 MB (17.45%) ── elements │ │ ├───5.99 MB (02.85%) ── slots │ │ └───0.14 MB (00.06%) ── misc │ ├───18.58 MB (08.85%) ── string-chars │ ├───18.33 MB (08.73%) ── analysis-temporary │ ├───11.21 MB (05.34%) ── script-data │ ├────5.88 MB (02.80%) ++ shapes-extra │ ├────2.53 MB (01.21%) ++ type-inference │ └────1.72 MB (00.82%) ++ (2 tiny) ├───16.10 MB (07.66%) -- gc-heap │ ├──14.49 MB (06.90%) ── decommitted-arenas │ └───1.61 MB (00.77%) ++ (3 tiny) └────6.02 MB (02.87%) ── runtime 88.51 MB (100.0%) -- js-main-runtime-gc-heap-committed ├──48.57 MB (54.88%) -- used │ ├──46.41 MB (52.43%) ── gc-things │ ├───1.61 MB (01.82%) ── chunk-admin │ └───0.56 MB (00.63%) ── arena-admin └──39.94 MB (45.12%) -- unused ├──39.94 MB (45.12%) ── gc-things └───0.00 MB (00.00%) ++ (2 tiny) 0 (100.0%) -- low-memory-events ├──0 (100.0%) ── physical └──0 (100.0%) ── virtual 8.28 MB (100.0%) -- window-objects ├──3.67 MB (44.34%) -- layout │ ├──1.83 MB (22.07%) ── style-sets │ ├──0.97 MB (11.76%) ── pres-shell │ ├──0.35 MB (04.27%) ── frames │ ├──0.19 MB (02.35%) ── rule-nodes │ ├──0.18 MB (02.12%) ── style-contexts │ ├──0.10 MB (01.15%) ── pres-contexts │ └──0.05 MB (00.62%) ++ (2 tiny) ├──2.65 MB (32.07%) ── style-sheets ├──1.94 MB (23.43%) -- dom │ ├──0.88 MB (10.59%) ── element-nodes │ ├──0.47 MB (05.62%) ── text-nodes │ ├──0.36 MB (04.37%) ── other │ ├──0.24 MB (02.84%) ── orphan-nodes │ └──0.00 MB (00.01%) ++ (2 tiny) └──0.01 MB (00.16%) ── property-tables 28.56 MB ── canvas-2d-pixel-bytes [2] 799.12 MB ── explicit 7.42 MB ── gfx-d2d-surfacecache 49.79 MB ── gfx-d2d-surfacevram 24.56 MB ── gfx-d2d-vram-drawtarget 0.00 MB ── gfx-d2d-vram-sourcesurface 505.41 MB ── gfx-surface-image 0 ── ghost-windows 690.50 MB ── heap-allocated 705.65 MB ── heap-committed 15.14 MB ── heap-committed-unused 2.19% ── heap-committed-unused-ratio 1.51 MB ── heap-dirty 107.50 MB ── heap-unused 498.59 MB ── images-content-used-uncompressed 103.00 MB ── js-gc-heap 0 ── low-commit-space-events 1,143.09 MB ── private 1,115.07 MB ── resident 6.13 MB ── storage-sqlite 1,658.92 MB ── vsize 4,659 ── webgl-buffer-count 11.38 MB ── webgl-buffer-memory 4 ── webgl-context-count 1 ── webgl-renderbuffer-count 4.07 MB ── webgl-renderbuffer-memory 68 ── webgl-shader-count 2,377 ── webgl-texture-count 143.12 MB ── webgl-texture-memory

Bug 689623 has landed. Has that improved matters?