VERY slow after upgrading to 551

[mvngti]

I have an instance that was still running 5.1.0c that I upgraded to 5.5.1 yesterday.

Upgrade went fine but it is extremely slow after the upgrade.
Version 551 on Fedora Core 10

I enabled debug logging and notice a 2second delay at the same point every time, but can not find any indication of what it is doing in that time:

See log sample below, but there is always a 2second delay after running "SELECT category, name, value FROM config".

Any ideas or suggestions anybody?

tx
M

--

Tue May 11 18:53:18 2010 [2655][-none-][INFO] Query:SELECT category, name, value FROM config
Tue May 11 18:53:18 2010 [2655][-none-][INFO] Query Execution Time:0.0023040771484375
Tue May 11 18:53:20 2010 [2655][-none-][INFO] Query:SELECT id FROM outbound_email WHERE type = 'system'
Tue May 11 18:53:20 2010 [2655][-none-][INFO] Query Execution Time:0.00028514862060547
Tue May 11 18:53:20 2010 [2655][-none-][INFO] Query:SELECT * FROM outbound_email WHERE id = '1c69b3fd-ceaa-6a97-029c-492a92bb14b3'
Tue May 11 18:53:20 2010 [2655][-none-][INFO] Query Execution Time:0.000244140625
Tue May 11 18:53:20 2010 [2655][-none-][DEBUG] We have an authenticated user id: 1

[max4]

maybe 5.5.1 need more resources , did u try to increase memory and mysql setting to optimize it ?