Since switching from 1.7.9 to 14w19a, I have been seeing a significantly lower fps at all times. In 1.7.9. I run 100-140 FPS and around 20-50 FPS in 14w10c, 14w17a, 14w19a, 14w20a, and 14w20b. I have tried lowering all settings to minimum, and still get the same low fps.
i5 760 @ 2.8 GHz
8 GB Ram
GTX 660
Fullscreen
I have 2 1920x1080 displays
A friend also reporting same problem.
i5 3570K 3.4 GHz
32 GB Ram
GTX 780
Fullscreen
Also has 2 1920x1080 displays
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I have also the same issue. My PC specs are way worse than yours, but still in 1.7 I get smooth, 40+ FPS in intensive areas, while in the versions, you've mentioned (starting from 14w10c and up) I got FPS below 30 everywhere and stuttering. FPS drops a lot when I look down while on the ground and after a few seconds it goes back to normal, but as soon as I move my mouse FPS drops down again. Even on Smooth lighting OFF, Fast graphics and lower render distance, the fps is almost the same. I've heard you guys saying that FPS will decrease at the cost of engine optimization, but that's way too much. In one month time I might not be able to play Minecraft on PC, that can run Skyrim just fine. I have a feeling that this new block model system is behind this...
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Please report all versions since 14w11b to better ensure Mojang will fix the bug in the next release/pre-release
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Check to see if you think this may be related to MC-129. If you think it is, make a comment there, vote and watch the issue so it gets the attention it deserves.
if you think this is a discrete, new bug (rather than the continual re-emergence of an old issue) stick it out here.
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I have experienced what is described in MC-129. This is not the same thing. Constant low FPS for all developmental versions after 1.7.9. With minimum video settings I have over 200 fps in 1.7.9, and in all developmental versions, after 1.7.9 I rarely get over 40 with the same settings. Changing the video settings does very little to affect the fps. GPU and CPU barely in use, while game is running. I tried several fixes on my end, and eventually just started opening in all versions I could find, everything from 1.7.9 or earlier I get 200+ fps every developmental version after I see 50 max, usually around 30.
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Can confirm this,
My laptop is getting 25 FPS in 14w20b and 50 FPS in 1.7.9
Specs are:
Intel Core i7 3630QM 4 cores @ 2.4 GHz
6 GB ram
GT 610M
Fullscreen - 1366x768
My desktop also has this issue, 30 FPS in 14w20a and 70 FPS in 1.7.9
Specs are:
AMD Phenom II 840 4 cores @ 3.2 GHz
8 GB ram
GTX 760
Fullscreen - 1920x1080 (+ additional 1440x900 monitor not running MC)
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I am noticing this in 1.8pre1 and 1.8pre2 in comparison to 1.7 stable.
Desktop specs:
Intel Core 15 4760 @ 4.1Ghz
8GB RAM
NVidia 750 w/ 2GB VRAM
Fullscreen res of 1920x1080
I also have a 2nd screen, although MC does not display on it.