Lag spikes even with great computer

[SaltySquirrel]

Hello,

I recently have downloaded Tekkit and finally was able to play on it. I set my video settings to what I usually do, and start rolling.

 

I enter the world with 1-5 FPS.

 

I tried everything. I heard decreasing RAM allocation reduces the lag, but that made no difference. I even installed Optifine - nothing. 

 

I have the latest version of Java, I have a quad core CPU, 8 gigs of ram, and an Nvidia GTX 720. What's going on here?

[disconsented]

I don't know where you got the idea of 'great computer' from. A 720 is a low end card, 8GB of RAM and a Quad Core is common place. Heck you probably have a FX processor in which cause it doesn't have true cores.
Watch performance monitor that is built into windows that will show you the issue

[Curunir]

Run it with default ingame settings and driver settings, then see what fps look like.

Don't forget that Minecraft runs on Java, which can be an order of magnitude less efficient with resources than the APIs that most other games run on. Also, it doesn't scale like other games, especially not with graphics cards.

Edited February 10, 2015 by Curunir

[Torezu]

Set Advanced OpenGL to Fast, not Fancy, if you're running with OptiFine.  Also, make sure you have the correct version of it.  Are you running on a laptop?  RAM allocation should be ~2-3 GB; no more is usually needed.  Try providing a little more information on the settings you're actually using.

[Ender_Gamer]

Do you mean like lag SPIKES? jsut for a few seconds? Or constant lag?