For the past few months i have been getting MAJOR lagg in minecraft ever since I've upgraded to the snapshots. But in 1.7.10 i get 100fps to 300fps and in the snapshots i get 10-40fps with the same settings on BOTH of my pc's. Ask if you need more info.
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What operating system are you running?
What Java Runtime Enviroment are you using?
Which Java Virtual Machine arguments are you using?
What processor, how much RAM and what graphics card do you have?
What are your settings in the Minecraft video settings menu?
Is the world you're playing a world that was created prior to 1.8?
In that case, could it be that the world format conversion has caused problems?
Fill in more information and elaborate your ticket. Low framerate is not "lag" and do not write in all upper case letters, be more descriptive.
Attach a screenshot from inside the game and have the debug info open in the game.
F3 to open debug info.
F2 to take a screenshot.

specs
Windows 8.1
mobo:msi
system type:x64-based pc
processor:AMD FX(tm)-6300 six core processor
8gb of ram
video card: gigabyte R9 270x 4gb
java 64bit
is this enough?

Was the world created before 1.8 (like 1.7.x) or is it fresh?

it was created in 1.8

snapshots

Duplicate of MC-45458

What do you mean by duplicate of mc-45458?

simple, that you created a duplicate of that bug report