Our Library has been testing Firefox 4 with Koha 3.0.6 and have found that Koha runs faster in Firefox 4 than what it does in Firefox 3 and under.
JavaScript performance is one of the major areas of focus for browser developers these days. Chrome raised the bar for everyone, and Mozilla has been playing catch up. Here's a fairly recent comparison (Windows only): http://legitreviews.com/article/1347/1/ Mozilla doesn't need to be asked to improve JavaScript performance. They're trying.
At present, we avoid using Google Chrome with Koha, because we find in the Returns screen it fails to alert us to any Holds/Requests on items
This is the second report I've heard of this recently, but I've never seen it myself. Can anyone provide some details about what conditions lead to the problem? -- Owen -- Web Developer Athens County Public Libraries http://www.myacpl.org