User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.1) Gecko/20020826 Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.1) Gecko/20020826 Almost all pages under sina.com.cn have such problem. The page renders correctly, but with javascript the performance is bad. Having several tabs from it's homepage link open, one can hardly have anything done in mozilla and the process loads constantly all the CPU idle time. Reproducible: Always Steps to Reproduce: 1. Go to http://www.sina.com.cn. 2. The interactive speed is not good even with the single page loaded. 3. Open some links concurrently either in new window or new tab, you'll get really bad performance. Actual Results: Browser acts very slow, loads CPU very high, could even hang mozilla forever. Expected Results: Act as fast as, for example IE.

My system: WinNT4.0(SP6) 500 MHz 128 RAM I'm having no performance problems at all with this site with Mozilla trunk build 2002092308 on WinNT4.0. With the main page open, and four new tabs opened from links there, my CPU remains low. (around 5-7%, with occasional spikes to 25%). Note: when I load this site, I do get two alertboxes that say, "Redirection limit for this URL exceeded. Unable to load the requested page." Once I dismiss those, however, the site looks the same in Mozilla as it does in IE6. I am only missing the ads that you see in IE6 in the left and right margins (that follow you when you scroll). I assume these are missing from Mozilla because of coding errors at the site. These errors are visible in Tools > Web Developement > JavaScript Console: Error: telelayer is not defined Source File: http://www.sina.com.cn/ Line: 806 etc. etc. Gary: I see your build is from 2002-08-26. Could you try the same Mozilla trunk build (from 2002-09-23) as I have and see if you still see the problem? WARNING: trunk builds dated after 2002-09-23 have new problems, so don't try them! Also: 1. What are your machine specs? 2. Are you going through a proxy? 3. What version of Flash do you have? (Help > About Plug-ins) 4. Do you get the two alertboxes I mentioned above?

I don't see JavaScript functions being called at all once the page has been loaded. To see this: 1. Load the site in Mozilla 2. Open Tools > Web Development > JavaScript Debugger 3. Click on the "Stop" button (red "X" at upper-left) 4. Nothing happens! We don't stop anywhere in JavaScript. This shows that once the page loads, no JavaScript is being called. If there were, the debugger would stop execution - Based on this, reassigning to Browser-General until we can get further information. As I mention above, builds from today may not work at all on this site: but I think that's a different problem affecting many different site. To test performance at this site, I am using Mozilla trunk binary 2002092308. Does this site hog the CPU for anyone else with that build date?

One other point: I do occasionally see little child windows opening at the lower-right of my computer screen. These are independent windows; I can't see what's in them: they disappear almost immediately. Is anyone else seeing these?

OK, this site uses at least 6 <object> tags for Shockwave Flash. For example: <object classid="clsid:D27CDB6E-AE6D-11cf-96B8-444553540000" codebase="http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab#ve rsion=5,0,0,0" WIDTH="585" HEIGHT="50"> <param NAME=movie VALUE="http://ad4.sina.com.cn/button/hanwang/fc585x50-020924.swf"> <param NAME=quality VALUE=high> <embed src="http://ad4.sina.com.cn/button/hanwang/fc585x50-020924.swf" quality=high WIDTH="585" HEIGHT="50" TYPE="application/x-shockwave-flash" PLUGINSPAGE="http://www.macromedia.com/shockwave/download/index.cgi?P1_Prod_Vers ion=ShockwaveFlash"> </embed> </object> Reassigning to Plug-ins for further analysis. Is this possibly a dupe of bug 132759, "[HANG]high(100%) cpu usage with Flash: WM_USER+1 events given too high priority and starve UI" ?

Well, I now don't see such great performance problem in my mozilla 20020826 again, but my CPU still loads at about 40%-60%. I think it's still higher than we expected. Your 5%-7% is ideal, and mine performance well at other main portal sites in China like 163.com and sohu.com. Actually I met the problem several days ago, and sina.com.cn may already fixed something so we can't reproduce the browser hanging problem. I agree with your guessing about the plug-in problem. After I disabled Flash plug-in (move NPSWF32.dll out of the plugins dir temporarily), the website performance so good, at 0-5% of CPU usage. My environment: - Desktop: DIY - Intel BX7+ mainboard - Celeron 733 - 256M memory - Windows 2000 Professional SP2 - Laptop: COMPAQ Evo N400c (http://www.compaq.com/products/notebooks/n400/n400-subfamily.html) - Intel PIII 700 Mobility - 128M memory - Windows 2000 Professional SP1 - Mozilla build/plug-ins almost the same - Mozilla 1.1 (Gecko/20020826) - Shockwave Flash plug-in NPSWF32.dll, v6.0r47 - Adobe Acrobat plug-in nppdf32.dll, v5.00 for Netscape

yes, sina was one of the reported sites for bug 132759 and that has since been resolved. The fix landed on hte trunk on 20020926, download a version after that and you will see the difference. marking as dup *** This bug has been marked as a duplicate of 132759 ***

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