Unfortunately this is what happens whn an MMORPG becomes as big and popular as runescape now is. I rememeber when we were amazed when the first 50K players were on at one time. Now its usually 3x that.
This is a big issue, Jagex cannot just keep adding worlds. We need more game space. Although, this would only affect f2pers =(
I'm afraid you may have to stop playing at 6-8pm GMT like many other players who are finding it increasingly hard to do anything with all of the games resources being sucked dry by many players at one time. I've certainly stopped playing then.. not fair, i know. =(
Are pures really that bad? Yes, okay, when its something silly like a pure woodcutter, but pures are usully just players that own in wildy.
Go and make a pure prayer character.

im trying to