Sidewise often freezes entire browser while page is loading with spinning favicon

Sidewise often locks up my entire browser while a page is loading, page loads slow, can't scroll, change tabs, or use hangouts app without delay of 5-10 seconds or more. Issue does not occur with Sidewise disabled.

I've tried most configuration options on/off (including animations), but no change. I even tested some experimental chrome://flags options but still does it. Only other extension I'm using is uBlock Origin, which I tried toggling off too.

I can't quite narrow down exactly what pages trigger it but a lot of google pages do such as https://play.google.com/store/apps/ but it seems like Sidewise is causing some sort of locking/blocking of certain browser processes/threads while certain pages are loading.

Using single monitor, 1080p LinuxMint 17.3 Cinnamon (Ubuntu 14.04.4 LTS)

Using latest stable Google Chrome Version 50.0.2661.75 (64-bit)

Output of Chrome://gpu

Graphics Feature Status

• Canvas: Software only, hardware acceleration unavailable
• Flash: Hardware accelerated
• Flash Stage3D: Hardware accelerated
• Flash Stage3D Baseline profile: Hardware accelerated
• Compositing: Hardware accelerated
• Multiple Raster Threads: Enabled
• Native GpuMemoryBuffers: Software only. Hardware acceleration disabled
• Rasterization: Software only. Hardware acceleration disabled
• Video Decode: Software only, hardware acceleration unavailable
• Video Encode: Hardware accelerated
• WebGL: Hardware accelerated