Hiya, folks. Im surfing on my old one computer (Pentium 4 661 3,6 ghz with 2 mb l2 cache, 2gb ddr2 ram samsung pc5300 and
without pagefile) with windows xp sp3. Iron is upgraded to 9.0.600.2 (74100). After system starts used RAM is about about 170-220 mb. Launched Iron adds 400mb more (old vesions added about 200-300). After using Iron about hour or more it uses not 400, but 600-800 mb and even more with closed tabs (up to 1.2 gb of RAM, even games use less

) so i have to reboot browser. Why it happens? In Opera i can open 100-150 tabs and i won't get virtual memory overflow error (i'm using both Iron and Opera).
Moreover it loads CPU too much: from extensions i'm using adblock and when i open any link browser freezes for 1-2 seconds (CPU load rises to 60-70% for this time), when page contains bunch of pictures it takes about 5 seconds to "unfreeze" so i have to turn adblock off when opening too much links. Tried with Opera - all worked pretty fine without freezing and stuff.
So this is my problem. Sorry for bad english - i'm from Russia.