I can't imagine how powerful of a computer you're using to get more than 4 fps while running yesterbreeze. Did you set the loaded cell buffer bellow 9?
Well, I just got a new laptop a month or two ago. If you are interested, then the brief specs are:
Intel® Core2 Duo CPU P8600 @ 2.40GHz, 4GB DDR2 RAM, ATI Mobility Radeon HD 3650 512MB dedicated memory (and for that Windows Vista rating thing it gets 5.2).
I was also running MGE (distant land draw distance set to 5) and enbseries while taking video with Fraps (and my vanilla MW view distance was set to full). I only really encountered a few 1 second lags when I moved from one cell to another and it had to load, which I removed when editing the video. But, other than that, it didn't really lag at all.
I'm not sure what you mean by setting the loaded cell buffer below 9, so I probably haven't changed anything to do with that...