This problem has been fixed with java update 1.7.0_65 and no longer occurs
I do not have VSYNC enabled. Also switching the game to Java 6 does not solve the issue. I will note that when running with java 6, the fps fluctuated from 30 for longer periods of time, stabilizing around 40-45 for about 5-10 secs before stabilizing at exactly 30 again for most of the time.
I also checked the snooper settings and saw that the game is unable to determine the display rate of my monitor correctly (snooper reports monitor display rate as 0 when it is actually 60).
Enabling VSYNC brings a whole other problem as this too locks the fps at 30, even at lowest video settings and render distance (but this should be a separate issue so I will work on that later).
This problems still exists for me on 14w31a using OS X 10.9.4 and java version 1.7.0_65. The fps does occasionally spike during gameplay to rates higher than 30 (I think this is due to the new rendering code introduced in 14w30a) but it is still mainly stable at 30 fps. I have seen it reach up to 120 fps for a second before dropping back down.
Here is the complete output from the console. It still looks messy in the launcher, just not when I paste it
[19:40:55 INFO]: Minecraft Launcher 1.4.4 (through bootstrap 5) started on linux...
[19:40:55 INFO]: Current time is Jun 24, 2014 7:40:55 PM
[19:40:55 INFO]: System.getProperty('os.name') == 'Linux'
[19:40:55 INFO]: System.getProperty('os.version') == '3.15.1-1-ARCH'
[19:40:55 INFO]: System.getProperty('os.arch') == 'amd64'
[19:40:55 INFO]: System.getProperty('java.version') == '1.7.0_60'
[19:40:55 INFO]: System.getProperty('java.vendor') == 'Oracle Corporation'
[19:40:55 INFO]: System.getProperty('sun.arch.data.model') == '64'
[19:40:55 INFO]: Refreshing local version list...
[19:40:55 INFO]: Refreshing remote version list...
[19:40:55 INFO]: Refresh complete.
[19:40:56 INFO]: Loaded 5 profile(s); selected 'gamemango'
[19:40:56 INFO]: Refreshing auth...
[19:40:56 INFO]: Logging in with access token
is the bug fixed in the 1.7.5?
I posted the crash report when in fullscreen mode
Do you want me to be in fullscreen mode using the os x fullscreen button when I crash it?
The Debug screen is the only way I was checking my fps. If it helps, I am using intel hd 3000 on late 2011 13 inch macbook pro.
EDIT - I have further tested and it seems that the fps actually can go past 30. The problem is that the game performs better when using the keyboard shortcut or the option menu to change to fullscreen. I was getting ~15 fps less when using the native mac fullscreen button.
EDIT 2 - Try turning your render distance up (I found my results using a render distance of 8 chunks, I tried it with 2 chunk render distance and the difference was much less noticeable)
I posted this as an issue because it used to work fine with repeaters until a recent snapshot.
Is it possible to transfer the data (which mob spawns) from the spawner block to the spawner item?