A guildmate of mine has always had full effects (maximum selection possible) and barely lagged before merge. Now he gets lag spikes once in a while keeping those settings. I'm pretty much the same as him.
Please note that there are many aspects of your computer setups which could contribute to lag, including, but not limited to: RAM usage, Video memory/GPU usage, Processor/Core usage, Hard Disk IO, and network usage.
The best thing to do, if you're experiencing lag, is to attempt to isolate and identify the times (what is happening in game, and where you are) when you are lagging, then make a post on the Technical Issues
forum detailing the issue as best you can, and including a post of your dxdiag and tracert
Posting a dxdiag
(Thanks Bob <3)
- Click Start and then Run or use the Search bar in the start menu on Vista/7
- Type "dxdiag" and select OK,
- When the DirectX Diagnostic tool opens select "Save All Information" at the bottom of the screen and save the file. Remember where you saved it!
- Open the file, copy all the info and paste into a post.