I just complete my previous post, so I managed to run Spark, without consuming excessive resources.
I was sure the problem was not my hardware, so I decided to downgrade my pc seven/64 in Xp (aka sleepless night) and there MIRACLE! : Everything worked fine, Spark vacuum around 10% of resources, no ralitenssement during the game, use 40% max ...
Unfortunately impossible to remain under xp (should not be messing around)
I upgraded to Seven/32 I have therefore lost 1Giga ram my system can not handle but spark works perfectly. Mystery: CONSUME 1,5* MORE RESOURCES THAT UNDER XP.
I keep this config and will keep you in the event of new problems.
Devs, for me the problem is with the Windows 7 platform. I hope it will guide your research to create a PATCH.
sorry for eventual mistakes, this is a google translation.