openjdk / icedtea java games taking a long time to load

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hey there ^^

i installed fedora 3 days ago and i'm stuck with this atm... i installed :

java version "1.7.017" OpenJDK Runtime Environment (fedora-2.3.8.3.fc18-x8664) IcedTea-Web Plugin (using IcedTea-Web 1.3.1 (fedora-3.fc18-x86_64))

while my pc is good atm its taking me about 5 minutes to load a game (for example runescape) is this normal? or did i do somthing rong?

also if aditional information is needed please tell me where i can find it

ty for ur time and for reply in advance :)

(edited : in windows it took about 10-20 sec)