Upgrade to 1.2.17 and increased CPU load? Help?

Today is the first peak day with 1.2.17, and it doesn’t seem to be working so well notice the sudden increase in load.

Upgraded a dated box from Asterisk-1.2.3 to Asterisk-1.2.17 and suddenly the box is lagging very badly, at points asterisk is using 90% cpu and call quality goes through the floor. Box is a 2.4Ghz Celeron and this is happening with as little as 7 concurrent calls, does 1.2.17 really need more grunt?

Thanks in advance,

Did you do something in Asterisk console session(s) such as escaping into a shell?