Sort and “Show Related”
GMail's IMAP server currently lacks the SORT and THREAD extensions. Xuheki uses SORT in order to sort the summary view when a column heading is clicked and THREAD to display “related messages”. Without these extensions, the only way to implement such functionality is to download all message headers from the IMAP server and do the sorting/threading ourselves. This would consume bandwidth and would take time. That's why most IMAP clients appear to be slow with GMail.
At this moment I don't plan to implement client-side sort/thread.
If you find other issues, please comment here.
