Simple Edit Window - Slow in IE6 & IE7

We have just upgraded our version from 3.14.5 to 3.16.6 - by and large successful. However, an issue that was present in the former version has come across with the latter version. When editing documents (HTML) via IE6 and IE7 via the simple edit window upon hitting "commit" or "save" save time ranges between 2 - 7 minutes (timed) whereas the same function through Firefox is almost instantaneous (3 - 10 seconds). Any suggestions?

IE might be waiting for something to timeout

More like IE is taking time out - is this a common experience?