Animation slowdown on OS X 10.11

I posted on the users group as well, but this might get some attention from 
people familiar with the actual development of wxPython/wxWidgets on 
various platforms, and thus might be able to point me in the right 
direction. Using:
python 2.7.11
wxPython 3.0.2.0

I have a custom widget that is basically a gauge to measure a resource or 
whatnot. My application has been using this widget for years without any 
problem.

We recently made the switch to wxPython 3.0, which brought it's own 
problems, most of them solved already. We also started getting reports that 
our custom gauge animations are lagging very badly when there is more than 
a couple updating, the lagging getting worse as the number of currently 
updating gauges increases. This slowdown only happens on OS X 10.11. It is 
fine on 10.10 - 10.7 (our lowest supported OS X version). Seems to work in 
10.11 fine when run with wxPython 2.8.

Here are some gifs of the described problem. Unfortunately the OS X gifs 
are potato quality, but it's the best that I could do as I tried many 
screen capture programs that didn't work and had to settle for some crap 
quality one.

(each test has 16 gauges)
Windows: https://gyazo.com/5dd3982ee2ec9c4f92f27a196fab5b41 
<https://www.google.com/url?q=https%3A%2F%2Fgyazo.com%2F5dd3982ee2ec9c4f92f27a196fab5b41&sa=D&sntz=1&usg=AFQjCNEATiV9iPvARlSy4M36tGXkbDdcew> Shows 
how it's supposed to look and how snappy it is
OS X 10.10: http://www.gfycat.com/GreedyHelplessAltiplanochinchillamouse 
<http://www.google.com/url?q=http%3A%2F%2Fwww.gfycat.com%2FGreedyHelplessAltiplanochinchillamouse&sa=D&sntz=1&usg=AFQjCNEjOFRlOZUm3hJt87oXPcJGgYthcg> 10.10 
works well
OS X 10.11: http://www.gfycat.com/PassionateDefiniteGoat 
<http://www.google.com/url?q=http%3A%2F%2Fwww.gfycat.com%2FPassionateDefiniteGoat&sa=D&sntz=1&usg=AFQjCNFUJcmtd5kaHpR_Uxf14xl5LrwSeg> 10.11 
is majorly laggy when updating multiple gauges at a time 

Here is the test application code:
https://gist.github.com/blitzmann/cd698a62b741dd9a163a

Can anyone give any insight? I am not really a Mac person; I only have 
Hackintosh's to support development and investigate problems such as this.

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