It's kinda confusing, it seems we're talking about two different problems despite both related to a delay issue.

The first problem is just about the window refresh in Pegasus. When I launch it since the New Mail folder is full with lot of messages, Pegasus seems to freeze for a while. The windows look even not completely drawn and just part of the interface is visible (the toolbar, scroll bars yes but not all the contents in the main window)

The other issue happens when I download the emails. Despite I wasn't actually talking about that, there's an issue with that behavior as well. The Selective Download doesn't help as Pegasus takes a while to examine the number of messages not read still on the server. Therefore either way downloading the messages from the server, when there are let's say something like 400 messages already read, takes a lot of time. It has something to do with the method Pegasus reads the messages on the server as this problem doesn't occur with any other client I've tried so far.

The v.5 announcement it's been exciting and I wanted to install Pegasus again, waiting for the new release.

Starting from scratch I don't have filter neither folder and I've downloaded all the messages from the server, more than 500 emails.

When I've re-opened Pegasus I've noticed a long delay: it seems it reads all the emails (I've noticed it counts the amount of emails) and doing that the folder looks empty and the program doesn't respond.

Is there any way to fix this behavior?

Hope this is already addressed or is gonna be fixed in the next release. 

If you have 500+ messages to download from your SMTP service, you are probably seeing the effect of download timeout. You need to increase the time allowed for downloads Tools/Internet Options/Receiving POP3/Edit (your active definition)/General/Timeout

Martin 

[quote user="irelam"]IYou need to increase the time allowed for downloads Tools/Internet Options/Receiving POP3/Edit (your active definition)/General/Timeout[/quote]

I'm not sure whether this is the issue here: I understand that he's complaining about Pegasus Mail's failure to indicate its activity properly as the screen isn't refreshed - although I usually only encounter this if a rather large message is downloaded or Pegasus Mail applies its folder rules. The actual download is indicated by the status bar "count-up" while filtering resp. processing large messages looks like Pegasus Mail just freezes.

Maybe the user should try the Selective Download option and download just a small group at a time, in order to identify a possible bad message. It is also easier to avoid downloading huge messages that way. Is the user using Content Control rather than SpamHalter?  If so reducing the number of lines being examined to a number like 2000 might improve the situation

Martin