It seems snapshot 13w04a has a performance issue with HD texturepacks when Minecraft 1.4 didn't have any on same computer (but Minecraft 1.4 had more glitches and less features than 13w04a of course).
What happens is (in order):
Smooth framerate during ~30 seconds
Horribly laggy framerate during ~20 seconds (impossible to play)
Smooth framerate during ~30 seconds
etc...
The problem happens with a 128x up-to-date texturepack (optimized for 13w04a). However, the problem also happens with default texturepack but is less noticeable (it's just like a lag spikes).
The game doesn't crash so there is no crash-report.
Note:
My LWJGL library is up-to-date.
My computer (a dual-core one) has a good hardware and is able to run MassEffect3 without any problem.
The problem is less noticeable (or shorter) when using a lower resolution of texturepack
When the problem happens ingame, it also still happens in the main menu before stopping
During the problem, one core is at 100% but the other is iddle.
Can be related to MC-4349, MC-2098, MC-1514, MC-3130, MC-8304, MC-2176 and MC-2434
Related issues
Comments
OK
This ticket has been marked as a duplicate of MC-11875, in favor of the better description/information provided.
Snapshots are not Minecraft 1.5, please do not title them as such.