I seem to be experiencing some strange issues involving Botania's hourglass in single-player. I used a freshly-made world to test these issues.

Whenever I place an hourglass in the world, my computer's memory usage (not the in-game memory usage, but the memory usage of the computer itself) goes up from about 30% pre-placement to over 80% post-placement (as shown in the attached pictures below). The memory usage of the Java instance that is running Minecraft slowly climbs up while an Hourglass is present in the world. Removing the hourglass does not stop the memory from increasing, from what I can tell. Once the game is cancelled, the memory quickly drops back down to normal levels.

No other part of Botania has ever caused this sort of issue for me. I have had issues with modded Minecraft before involving openGL, so maybe the way the hourglass renders is causing it? Memory should not be an issue, as I allocate 2GB of RAM to Minecraft.

There is no information in the log file that points to anything abnormal, but here it is anyways:
http://pastebin.com/J0JRfXbv
And here are the pictures:
http://imgur.com/8ZwH558,O5kZiJn,VsQg3GX#0

Finally, these are the specifications of my computer and the java version I use for Minecraft:
Windows 8.1
Intel(R) Core(TM) i5-3330S CPU @ 2.70GHz 2.70 GHz
8.00 Installed Memory (RAM)
64-bit Operating System, x64-based processor.
Intel(R) HD Graphics 2500
Java version 1.8.0_25