Show downloads denied with 'too many files' or 'too many megabytes' as queued and automatically requeue them every so often.
See the Changelog for list of features and fixes currently only available in the nightly builds.
You raise a very good point. The process of updating the progress bar is relatively intensive for something that may be happening hundreds of times a second, if there are a lot of uploads and/or downloads in progress. If I were to try different possible improvements, would you be able to try them out and see if they make a difference?
I took your advice and limited the length of time each download and upload updates their progress. It's currently set to half a second, but I might add a setting later. Let me know if you notice a difference: