Outlook is very slow for me, but I only use it on my work laptop. Thunderbird is almost as slow, and that's on my own desktop. Even something simple like mousi

Outlook is very slow for me, but I only use it on my work laptop. Thunderbird is almost as slow, and that's on my own desktop. Even something simple like mousing over emails in the list is slow - there is a noticable delay between the mouse reaching each email, and the grey highlight.