For whatever reason, all the menus in 1.9 (options, main, pause, etc.) lag like crazy. If you swing your mouse around, the button highlights can't keep up and the background is very choppy.
I will also mention that I haven't noticed any lag fixes in the 1.9.3 snapshots.
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One of them is the 16w15b, one is 1.9.2, one is 1.8.9. All were taken in the same superflat world.
Outdated & broken Intel graphics card drivers, see MC-32606.
Update to 15.xx.xx.xx and report if the problem is persisting
OptiFine dosen't fix any lag issues. In fact, none of the suggestions the entire Minecraft community has made has actually worked. I'm pretty sure the only way to resolve this is for Mojang to rewrite some of the code. On the other hand, previous versions work fine, even without OptiFine (sometimes, I can even use max render distance without any problems).