Very slow with OWA

I use this app to access corporate emails through OWA. It works, but it is way too slow to be of any use!

If you didnt use the app for some time, the download of all new emails (from the oldest to the newest) takes forever before it reaches the recent emails (the ones you want to see).

For me, who would use that app 2 or 3 times a week, it makes this app so slow it is useless.

John Zo about Newton Mail - Email App, v7.9.8