SQL Load on Server is increasing badly

[SaN-DeeP]

I have been noting this since last 1 week, load on forums have gone very high. and it take a lot of time for a thread to get displayed, or whos online list or logging onto forums homepages properly.

here is the Online Users Load:
Page generated in 0.33739090 seconds (39.90% PHP - 60.10% MySQL) with 19 queries

showthread.php?p=34466#post34466 Load:
Page generated in 0.25890899 seconds (55.15% PHP - 44.85% MySQL) with 18 queries

Forums index.php Load:
Page generated in 0.28824997 seconds (29.54% PHP - 70.46% MySQL) with 14 queries

This load increases a lot when there are more then 10 users connected @ one time, and makes the entire forums go slow.
Can you please help me fix this.
And there are always more then 25 users :S
Need some help to fix this off please
Regards,
Sandy...