Problem with Comment Update

Hi,
I am using wordpress as a corporate blog. I face a peculiar problem in comment update.

Sometimes, after typing the comment and click submit button, the page remains as it is for long time. The status bar shows the progress bar, indicating the page is loading. It appears the page has been struck.

Later, i closed the browser and opened another window and accessed the same post. I could see my comments getting updated.

At another instance, when the same problem occured, I opened another browser and saw that the comments that i submited was shown, while the original window where I typed the comments is still loading.