Java Heap Memory

[MrKunji]

A few days my Minecraft stopped on using the average 1GB memory.
When I open a Vanilla Minecraft it uses normal memory, but when I open FTB Direwolf20 pack, it uses only 499MB and I start experiencing massive lag.
What I need to do to have back the old perfomace?

EDIT: It might be that the client is sharing memory somehow with the launcher, is this posible?

 

[JamiePhonic]

go to the options tab in the launcher and set the MAX RAM to 2 GB
that usually sorts out most client lag problems.

 

[Ashzification]

go to the options tab in the launcher and set the MAX RAM to 2 GB
that usually sorts out most client lag problems.

Not really. It helps for like 5 minutes. Adding more RAM just gives java more stuff, it doesn't help optimize the game-which is what's really needed to increase performance.
OP-try the suggestions here: http://forum.feed-the-beast.com/threads/jvm-arguments-for-modded-minecraft-updated-11-11-13.28994/

 

[MrKunji]

My computer's max memory is 1,75GB. So the launcher offers only 1GB for RAM but it still using only few MB. I've tried everything, even maxing out the alocated memory.

 

[Ashzification]

My computer's max memory is 1,75GB. So the launcher offers only 1GB for RAM but it still using only few MB. I've tried everything, even maxing out the alocated memory.

Your computer has 1 and 3/4 RAM? I doubt that.

 

[UniZero]

Your computer has 1 and 3/4 RAM? I doubt that.

I can only think that he has 2gb and his gfx card is using 256mb of that. Unless he has a weird combination of 1.5gb and 256mb of ram but that would be silly.

 

[MrKunji]

Sorry for the long time for reply. I was searching for an image hosting site.
Until it's solved FTB and Technic Launchers will be retired for a while, I will be playing on my personal 1.6.4 modpack.
I'll ask my father if I can upgrade the processor or make him buy another computer (it's a family computer, everyone uses it)
?-Maybe it's using only one processor, making the other dormant while I play. The Enviroment Variables were altered many times but it don't solve the problem.
The screenshots:
http://imageshack.us/f/43/6yv0.png/
: Direwolf20 1.5.2 current memory use

http://imageshack.us/f/844/v8zr.png/
: Direwolf20 1.5.2 normal memory use

http://imageshack.us/f/14/1cm7.png/
: Vanilla normal memory use

http://imageshack.us/f/542/ype8.png/
: Reads - System
Manufacturer: AOC
Model : EVO

Processor: AMD Athlon(tm) Neo X2 Dual Core Processor L325 1.50 GHz
Instaled Memory(RAM): 2,00GB (usable: 1,75GB)
System Type: 32 bits OS

Graphic Card(Not stated on the screenshot): ATI Radeon HD 3200