Version 1.6.x is causing much more framerate issues than 1.5.x, I go from performing around 40-60 FPS to 10-30 FPS. No performance boosting mods were used in 1.5. This is probably due to the new Resource Pack system.
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This isn't a duplicate. At all. It's because of the Resource Pack system, not the launcher.

No. Failing to prefer GPU over crappy integrated graphics.

Telling me "get a better computer" isn't gonna solve the problem. It's not my fault my laptop's the only good computer in my household!

No one said get a better computer. Your graphics drivers are prioritizing the integrated graphics chip inside your laptop, instead of the dedicated graphics hardware. Fix it so that minecraft/java is a priority, and you will find it works perfectly.
FYI, the resource system could not possibly cause the kind of lag you are claiming it does.

@Gabe V: I didn't say anything like this.
Read MC-15072: Minecraft 1.6 prefers the integrated graphics of your laptop over the GPU of your laptop whereas Minecraft 1.5 does it vice versa.

@Cloudy Please tell me how to do so, in that case.
50+ Duplicate of MC-15072, please use the search function to see if your bug has already been submitted. Currently over 58% of tickets are being closed as duplicate.