QT wallet speed issue caused by shadows on macOS

[volbil]

Describe the issue

QT shadows created by QGraphicsDropShadowEffect class is killing my MacBook, wallet slow and irresponsive. After I removed them (I removed getShadowEffect() which add them to GUI element) wallet start working like a charm. I haven't tried wallet on other systems, so it could be macOS specific issue.

Can you reliably reproduce the issue?

Yes, this issue is occured each time when I build QT wallet on my own.

If so, please list the steps to reproduce below:

1. Autogen and configure Raven without any additional falgs on macOS.
2. Build it.
3. Run raven-qt wallet.

Expected behaviour

Wallet works without any issues.

Actual behaviour

Instead wallet work slow and barely respond to any interactions.

Machine specs:

• OS: macOS Mojave 10.14.1
• CPU: Intel Core i7 2,2 GHz
• RAM: 16 GB 1600 MHz DDR3
• Disk size: 256 GB
• Disk Type (HD/SDD): SSD

[blondfrogs]

@volbil Thanks for creating this, on the next release, I will remove the shadow effects of the wallet as performance is preferred over the look of the wallet.

[blondfrogs]

@volbil Can you please test the build on my personal repo as see if my changes also fix this problems you were running into.
https://github.com/blondfrogs/Ravencoin/tree/test_issue_577

[volbil]

Hello @blondfrogs. Just tested your fix, works slightly better than before, but shadow on sidebar still present. It makes UI bit irresponsive. After I commenting out this code qt wallet start working much faster. Here is final result without sidebar shadow:

[blondfrogs]

oops forgot about the side bar, that one is declared in a different area. Will update

[volbil]

Thanks @blondfrogs !

[HyperPeek]

fixed