UserAgent: Mozilla/5.0 (Macintosh; Intel Mac OS X 1090) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/31.0.1650.48 Safari/537.36 Example URL: Steps to reproduce the problem: 1. Hookup to 4k monitor 2. Load a cached page, like facebook for nytimes 3. Content takes at least 10 seconds to completely load, but partial content appear immediately What is the expected behavior? Should load immediately, especially often used, cached sites What went wrong? When loading cached site, page takes a long time to load (10+ seconds) and the CPU spins (process takes 110% CPU) Did this work before?
N/A Chrome version: 31.0.1650.48 Channel: stable OS Version: OS X 10.9.0 Flash Version: Shockwave Flash 11.9 r900 Work fine when not connected to a 4k monitor, I have the 39 inch seiki monitor. Disabling vsync in OS X does not fix the issue but others are welcome to try it and see if they have a different experience. I disabled it like this: $ sudo defaults write /Library/Preferences/com.apple.windowserver Compositor -dict deferredUpdates 0 and then reboot the machine. To re-enable just replace the last 0 with a 1 and reboot again. Again with my setup, this does not improve anything with Chrome rendering speeds.
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I'm using latest Chrome (31.0.1650.63) and latest OS X (10.9.1) as of this writing. On a good note, I'm starting to warm up to Firefox a bit. They have really made some nice changes as of late.
1) 10.9 (haven't installed 10.9.1 yet) 2) Seiki 4k 3) hd6850 Display Port - Accel DP to HDMI 1.4a active adapter - Included Seiki HDMI cable I'll try to post a video of this asap. There is a pretty remarkable difference when loading webpages on the 4k versus my other 1080 monitor. Try shutting down chrome with 10 tabs open, then opening it when it is on the 4k monitor. They should basically stall completely. Then drag to another low res monitor and they should load near instantly. For those that don't have issues or the vsync doesn't help, I'd be curious to understand your chrome flags in regard to rendering, and see what happens if you install the quartz debug tool. There is a definite interaction between vsync and the rendering on the 4k monitor, but it may depend on other settings that interact.
With quartz debug I can setup the same situation described above with the 10 tabs. Except, instead of moving the chrome window, I disable beam sync via Quartz Debug, and the tabs all instantly load, just as if I had dragged the window onto the lower res monitor.
Specifically using this tool: I was able to run:./BeamSyncDropper2Lion 2014-01-06 15:27:47.852 BeamSyncDropper2Lion2450:507 Starting BeamSyncDropper2 by Withoutaface 2014-01-06 15:27:47.859 BeamSyncDropper2Lion2450:507 BeamSync disabled! A few things: 1) I was (still am) very concerned with running what appears to be a somewhat hackish tool like this written for Lion and I'm on Mavericks. 2) It solves my slow rendering issues with Chrome and my setup (a good thing) 3) Causes tearing as I move my windows around on the OS X desktop (a bad thing) 4) Not sure what other ill effects this may have since I just installed it moments ago. It does provide me an option to use Chrome but with some negative side effects. Good news is that it does alleviate my issue and thanks to @nlr06 for sharing this information. I haven't tried the vsync trick, but I have captured a relatively clean trace using chrome://tracing (attached after gzipping).
I visited, and it paused for about 30s with the page half-drawn. Plenty of RAM + not many other apps open. Just hooked up a pq3231q and very slow to render pages when on the 4K display, when I drag it back it works as before. Mac 10.8.5 AMD Radeon HD 6770M: Chipset Model: AMD Radeon HD 6770M Type: GPU Bus: PCIe PCIe Lane Width: x8 VRAM (Total): 1024 MB Vendor: ATI (0x1002) Device ID: 0x6740 Revision ID: 0x0000 ROM Revision: 113-C0170L-573 gMux Version: 1.9.24 EFI Driver Version: 01.00.573 Displays: Color LCD: Display Type: LCD Resolution: 1920 x 1200 Pixel Depth: 32-Bit Color (ARGB8888) Main Display: Yes Mirror: Off Online: Yes Built-In: Yes PQ321: Resolution: 3840 x 2160 @ 30 Hz Pixel Depth: 32-Bit Color (ARGB8888) Mirror: Off Online: Yes Rotation: Supported Connection Type: DisplayPort.
Hi, I can confirm I have the same issue, on a 15inch Retina Macbook Pro (2012) and Seiki 4k monitor over HDMI at 30hz. I'm running the latest OS X which at the time of this message is System Version: OS X 10.9.1 (13B42) Kernel Version: Darwin 13.0.0 I've seen similar behavior in Chrome, Chromium and Aviator which is based on it. As soon as I move the window back to my laptop's display, speed picks up.
This actually makes Chrome unusable with the external display. I can't seem to identify if some sites trigger the condition worse than others (sites with lots of graphics, lots of javascript, etc) - it seems to be pretty random. Can you try out Chrome Canary to see how it behaves there? I have some fixes there, and some in progress.
There are some vsync issues that have been fixed recently and some that need to be fixed still. When using multiple displays, we don't track the vsync of each display separately (yet, patches in progress), so you may be getting stuck at 30Hz on all monitors, or, if you have a 60Hz monitor, it may be pumping frames to the 4k display twice as often as they are needed. Also, I'm working on a patch to make the browser main thread not block when it tries to swap frames - it may be that at 30Hz the main thread is blocked for 1/30th sec chunks of time instead of the usual 1/60th sec, and this is causing input latency, etc, etc. The switch to CoreAnimation will fix this blocking issue. Just tried out the latest Canary.
I can say it is definitely better, at first, where sometimes it appears to be fixed, and others it still produces the same behavior of where you can fix a stall by clicking on a higher refresh rate monitor. Seems like the more I used it, it eventually got back to how it was before. I don't experience input latency of any kind. Just sometimes it appears that the loading of a page is somewhat stalled.
At that point if I click on the other monitor, it usually instantly recovers from the stall. At least my testing with this newest build, sometimes the clicking on the other monitor doesn't recover it. I just recorded some video of it, and will upload it. It'll take some time, but this compared safari beside canary for the same site, and records the loading of the website that is associated with the time line data I'm attaching to this post.
What's the format of the TimelineRawData? Can you try getting a trace of the bad behavior (open a second window to about:tracing, press record, press the record button again, then press stop after a couple of seconds - don't worry if the buffer fills up - it just wraps). Another thing to try is running with CoreAnimation. I'm not sure if this is worth your time yet, cause it's really crash-happy and has janky animation issues (hopefully to be fixed momentarily). If you want to give it a try, it can be run from the command line as /Applications/Google Chrome Canary.app/Contents/MacOS/Google Chrome Canary -use-core-animation. Same thing for me. On one 27' iMac, I had a 4k display attached (yes it works).
Chrome would exhibit these symptoms when Chrome's window position was moved to the 4k monitor, and the symptoms would go away just by moving the window to the 27' built in display. Now have a Mac Pro with just the 4k display connected. Chrome consistently slow. Plugged in a 27' Apple DisplayPort display (or rather, a different pre-Thunderbolt iMac 27' in target display mode).
Moved Chrome window there. Chrome suddenly fast in an obvious manner (my Facebook loaded in 1-2 seconds instead of 10).
I thought I would add some more information relevant to my 4k setup. My 4k setup was running at 30Hz and I had the monitor upside down and rotated 180 degrees because the monitor has BGR subpixels (instead of RGB) and I can't find any way in OS X to make font smoothing support BGR. The 27' iMac could only output 30Hz. This was over a single stream DisplayPort connection (if changing the display to multi stream, it go black). Now that I have the Mac Pro, I have 2 ways I can set up the 4k display: 1.
Multi stream DisplayPort, and I get 60Hz, and no ability to rotate, BUT CHROME SEEMS TO RUN FINE 2. Single stream DisplayPort, and I'm limited to 30Hz, and can rotate the display, BUT CHROME IS EXTREMELY SLOW So I think it's fair to point out the possibility that some or all these things - completely outside the domain of Chrome - seem to be aggravating factors with respect to whatever's wrong. Cc: [email protected] [email protected] [email protected] [email protected] [email protected] [email protected] Status: Fixed A not-destroyed-in-transit 4k display arrived today. A good repro for the load-is-terribly-slow issue is navigating to about:settings on M34/beta. I tried this on TOT and it wasn't slow, and same with Canary.
A bisect got me which points to the fix being mac: Improve performance of throbber animations. So, thanks Andre for preemptively fixing this, and big bonus points go to #61 davideroberts for the diagnosis. This is fixed in Chrome Canary now, and will be fixed in M35 when it comes out. Of note is that there was basically nothing in about:tracing to indicate that this was the problem. I even reverted (et al) locally and added trace events in the display function, and it didn't reveal anything suspicious (calls were made once per vsync, and that was it). Instruments gave a vague hint that it might be a concern (like 3% of the CPU was being used for drawing things.
But that's on the lose-behind-the-couch order of magnitude). So that makes me glad I didn't have to debug this - there was basically nothing to suggest that the throbber animation could have such catastrophic consequences for performance.
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