One laptop is experiencing unusually sluggish JavaScript performance compared to the rest of the devices in the group

Currently, I am developing a web application that heavily relies on JavaScript. While most computers (all running IE6 unfortunately) have an average document.ready time of about 2 seconds, there is one computer experiencing extremely slow JavaScript execution times. This specific computer takes 40 seconds to complete tasks that only take 2 seconds on others.

I have been investigating the cause but have not made any progress in finding a solution. Both computers have identical specifications - an Intel Core 2 Duo 2GHz processor and 3GB of RAM. The slow computer does not have any additional processes running and consistently shows a high percentage of System Idle Process in the task manager, indicating no background processes are consuming CPU resources.

When observing the task manager on both computers during page loading, IE peaks at around 50% on both machines. They exhibit similar behavior except for the significant difference in JavaScript performance.

If anyone has encountered a similar issue or knows why this might be happening, please share your insights. Despite checking everything I can think of, the JavaScript performance on this particular laptop remains unexplainably poor.

Edit: Apologies for the vague nature of this question. The two computers seem identical in every aspect, yet their JavaScript performance differs drastically. I was hoping someone with previous experience could shed light on potential underlying causes that may not be obvious to me.

Answer №1

Experience efficient profiling by utilizing the Insights ajax edition, which is compatible with IE6.

Answer №2

After much investigation, I have finally uncovered the root of the issue for those who may be curious (or for future reference).

It turns out that the machines experiencing significantly slow performance were outdated and unpatched versions of IE6. Because this is within a corporate intranet environment, some users stopped receiving patches due to compatibility issues with a required application. It appears that one of these patches addressed a memory leak, explaining the drastic decline in performance.

I appreciate all the helpful suggestions provided during this troubleshooting process.

Answer №3

Encountered this issue several times in IE6, and my suspicion points towards the quicktime plugin as the culprit.

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