Horde/SquirrelMail failure with new PHP

I recently ungraded my php to 4.3.10 because of the security alert. The upgrade was performed through WHM and went fine. I then ran:
/scripts/updatenow
/scripts/installzendopt


Everything seemed to work fine. But last night I had 2 support tickets that SquirrelMail and Horde are very slow - to the point they actually time out. I tried my my account and sure enough it takes forever to load (minutes). Of course NeoMail works fine. That is why I believe the problem is with the latest PHP upgrade.

Has anybody seen a similar problem? Any suggestions? I do not have mmCache installed on this server.

Thanks,

 

 

 

 

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