Performance on linux

Hello great developers from JetBrains,

I'd like to ask if there is any chance of increasing performance of the newest PhpStorm, because it uses 30% of my 4GB memory.

I'd appreciate if someone could help me to improve this awesome IDE.

I use:
     HP Pavilion dv6 with Intel Core i5, 2x(4x)~2.36GHz and 4GB of memory
     Lubuntu 14.04.1
     I also use Chrome with only few tabs opened and music player
     I use JDK 1.8:

java version "1.8.0_31"
Java(TM) SE Runtime Environment (build 1.8.0_31-b13)
Java HotSpot(TM) 64-Bit Server VM (build 25.31-b07, mixed mode)

     and dual monitor

I know it starts with only around 400MB memory (btw. same as virtual memory).
I tried to edit vmoptions (by some blog posts somewhere) and its content is now:

-server
-Xms64m
-Xmx700m
-XX:ReservedCodeCacheSize=512m
-ea
-Dsun.io.useCanonCaches=false
-Djava.net.preferIPv4Stack=true
-Djsse.enableSNIExtension=false
-XX:+UseConcMarkSweepGC
-XX:SoftRefLRUPolicyMSPerMB=50
-Dawt.useSystemAAFontSettings=lcd

I use PhpStorm for daily use at work and I need to have it running nearly all day, but as longer I work, it consumes more memory up to around 1GB (and even more).

Thanks for any advise.

I respect your work, guys.

Lukas

PS: I'm enclosing Memory Snapshot by this link