I had problems with the third thing you mentioned, “User’s system slows down dramatically after install.” My Windows XP Pro had not been reinstalled for a year and a half and I had been putting it off. Because I had been experiencing problems I decided it was time to do just that. After everything was in, I installed the 2.4 version of Comodo again and immediately had the same slowdown. It was so bad that it took two hours to full boot the system and I couldn’t be sure things were running properly.

I used a boot disk to start the system and disable the firewall. Now everything was fine except I had only my router as a firewall.

Extensive searching of the Comodo forums gave me a quick fix. In the Security tab under Advanced is a section call Application Behavior Analysis. Click Configure and a window pops up with all options checked. Unchecking Monitor DLL Injections allowed me to start the firewall and run normally now. It is suggested to shut down an application at a time and reenable this option but my system is so slow with this enabled that Comodo Firewall 5 would likely be out before I got through all of my applications. For now I’ll just run it with the option unchecked. I’m hoping this is resolved in the final version 3.

One last thing about another slowdown. Users of uTorrent can experience extreme slowdowns in their torrents with this firewall. A search in the forums for “firewall slowdown utorrent” give good advice on resolving this.