Javascript / Client Side Development :: Calling javascript freezes browser window


	Calling javascript freezes browser window When I open a webpage with javascript my browser (both IE6 and FF2.0.0.3) freezes anywhere from seconds to more than a minute. During that period, the browser is frozen and windows (XP-SP2) is very poorly responsive. There is no significant CPU-load. When I disable javascript in FireFox, everything works smoothly again. I have uninstalled MS javascript and SUN javascript, however, javascript is still being executed (when enabled in FF). - Is there another javascript engine (besides MS-VM and SUN) that might be screwing up my system? - Any suggestions how to troubleshoot / fix this problem? Thanks, Wouter Pelgrum On May 21, 1:33 pm, wpelg@gmail.com wrote: - Hide quoted text - > When I open a webpage with javascript my browser (both IE6 and > FF2.0.0.3) freezes anywhere from seconds to more than a minute. During > that period, the browser is frozen and windows (XP-SP2) is very poorly > responsive. There is no significant CPU-load. > When I disable javascript in FireFox, everything works smoothly > again. > I have uninstalled MS javascript and SUN javascript, however, > javascript is still being executed (when enabled in FF). > - Is there another javascript engine (besides MS-VM and SUN) that > might be screwing up my system? > - Any suggestions how to troubleshoot / fix this problem? > Thanks, > Wouter Pelgrum JAVA != JavaScript On May 21, 3:33 pm, wpelg@gmail.com wrote: > When I open a webpage with javascript my browser (both IE6 and > FF2.0.0.3) freezes anywhere from seconds to more than a minute. During > that period, the browser is frozen and windows (XP-SP2) is very poorly > responsive. There is no significant CPU-load. As you still don't get system warning "Script running on this page takes too much of ..." etc. : my best guess would be that the offending page is using synchronous XHR call to a very slow / overloaded server. Nothing to do with Javascript execution per se then. For a better help instead of "a page" show us _the_ page demonstrating your problem. > For a better help instead of "a page" show us _the_ page > demonstrating your problem. http://www.rabobank.nl/particulieren/ takes more than a minute to load with javascript enabled (during which the whole system is practically unresponsive). With javascript disabled it is loaded in about a second. But basically any page with javascript seems to cause some delay, sometimes only a fraction of a second per javascript item, sometimes significantly more. IE and Firefox show the same symptoms, another XP-SP2 PC on the same network handles the same pages without any problems. wpelg@gmail.com wrote: >I have uninstalled MS javascript and SUN javascript, however, >javascript is still being executed (when enabled in FF). >- Is there another javascript engine (besides MS-VM and SUN) that >might be screwing up my system? You seem to be confusing Java and Javascript. They are completely different. VMs pertain to Java, not Javascript. (And the MS Java VM is hopelessly outdated.) Javascript interpreters are built-in to the browsers. You cannor uninstall the Javascript interpreter that Firefox uses. You can tell Firefox not to execute Javascript. So the most likely problem here is badly written Javascript (assuming you really mean JS and not Java) in the page you're viewing. -- Tim Slattery Slatter@bls.gov http://members.cox.net/slatteryt > Javascript interpreters are built-in to the browsers. You cannor > uninstall the Javascript interpreter that Firefox uses. You can tell > Firefox not to execute Javascript. So the most likely problem here is > badly written Javascript (assuming you really mean JS and not Java) in > the page you're viewing. Okay, thanks for the explanation. But then it is even stranger that both IE and FF experience the same problem with pages (e.g. http://www.rabobank.nl/particulieren/ but also http://www.nytimes.com) that have worked fine before and are still working fine on my other PC. The problem seems to be related to javascript as disabling javascript in FF solves the delay (but is unworkable for most websites). On May 21, 5:31 pm, wpelg@gmail.com wrote: > > For a better help instead of "a page" show us _the_ page > > demonstrating your problem. > http://www.rabobank.nl/particulieren/takes more than a minute to load > with javascript enabled (during which the whole system is practically > unresponsive). On both IE and Firefox it takes ~ 4.1 seconds to load (average of 10 test loads in each browser, end of loading counted by "Done" message appeared in the status bar, an external capturer is used). My Dell notebook I took with me in Europe and tested with is very average by its properties: AMD Turion 64 X2 Mobile 1.8MHz 1Gb RAM Wireless 128Kb upstream / 256Kb downstream Internet connection For the page of such low complexity I would still expect 1-2 sec max but they are using a purely DIV+CSS layout, that always adds 2-3 times rendering time increase against of normal table layouts. Also their http://www.rabobank.nl/particulieren/javascript/unobtrusive_home.js used on the page is a nightmare of document.write's - with say flash movies written right to the document head section, so parser has to spend extra time to wait for all segments arrive and to bring the DOM tree into some acceptable state. Still 4-5 secs with progressive rendering (so you can see some part of the page right away) is totally OK - unless one is trying to call 911 online :-) There is no question of _1 minute_ delay here. That means either of: 1) You are using some legacy PC 2) For some reason your connection to these segments of the Web gets delayed. 3) You have some spyware/antivirus installed that takes forever to pre- parse the input before let it in to the browser. I would check first with 3) As the problem is not reproducible I'm out of other ideas. If nothing helps, install NoScript addon for Firefox and set script disabled for all problematic pages: https://addons.mozilla.org/en-US/firefox/addon/722 > That means either of: > 1) You are using some legacy PC I'm using a 2.4 GHz P4 with 1.5GB RAM. Previously, these pages loaded just fine... > 2) For some reason your connection to these segments of the Web gets > delayed. Another PC on the same network has no problems > 3) You have some spyware/antivirus installed that takes forever to pre- > parse the input before let it in to the browser. No antivirus installed, I just used an online scanner to check, no viruses either. Not sure about the spyware. I can imagine that spyware can seriously affect some processes, so I'll scan my system and see if there is something wrong there. > I would check first with 3) As the problem is not reproducible I'm out > of other ideas. If nothing helps, install NoScript addon for Firefox > and set script disabled for all problematic pages:https://addons.mozilla.org/en-US/firefox/addon/722 Okay, will do. Thanks! > 3) You have some spyware/antivirus installed that takes forever to pre- > parse the input before let it in to the browser. Just scanned for spyware, nothing found. So no virusses, no spyware, what else can cause the execution of javascript to slow down so significantly?