Lag Spikes with DW20 Modpack

[Uraniuoxied]

Let me enlighten you on some things about my computer and what I have done to try and stop this:

-Tried installing Optifine (Of course it crashed but worth a shot, so I got rid of it)
-Have 8 GB of RAM, 50% of that is being used right now with FTB DW20 pack up and running
-My graphics card is up to date and is good enough to run this pack

Now, exactly, why am I getting lag spikes every 4 seconds or so? This is frustrating and very annoying.[DOUBLEPOST=1386722330][/DOUBLEPOST]Update : Wow, I am an idiot xD I just turned off Vsync and now it is working fine and dandy! I am laughing so hard right now![DOUBLEPOST=1386722496][/DOUBLEPOST]Update 2: Turning off Vsync only "helped" get rid of it, but I am still experiencing it, just to a lesser extent.

 

[Uraniuoxied]

Really need help still, please.

 

[kittle]

I dont have any answers right away - but something you can try:
Hit F3 and watch the FPS numbers are you play. That may give you a clue as to the source as you move around.

Also watch the ram usage.
I got some nasty lag spikes while playing RR because something was leaking memory BADLY. ram use would go from 10% to 90% in 2 seconds, lag and then repeat. I never did find out the cause of the ram spike

 

[Uraniuoxied]

Been watching this already and it doesn't really help, the source isn't really anything in particular as far as I can tell. It might be chunk-loading but I don't know, I stand still in one area and it still happens.

I have my RAM monitor up and the grid shows a HUGE spike whenever a lag spike happens. Still need help on this.

 

[Uraniuoxied]

Never mind, chunk updates have nothing to do with this. My FPS is simply rising and falling. Not sure why it is, but it is.

 

[UniZero]

Are you using the jvm arguments from here.

 

[Uraniuoxied]

Found out what was happening, I simply needed to change the "used memory".

 

[Gilliam]

And how is that done for those clueless people out there. Like moi