Bug: variable scrolling speed

[A Former User]

A Former User last edited by

Hello.
I've noticed that a speed of scrolling (when I use mouse wheel) can be normal or slow. In some sites it is normal, in some - slow, in others — changes from one to one.

I've made screencasts with examples. I scroll by one turn of a wheel.
Google.com — https://yadi.sk/i/-QfMcbhD3ZCsSw (normal speed)
Habr.com — https://yadi.sk/i/2pKR2FPX3ZCsSS (slow speed)
4pda.ru — https://yadi.sk/i/t9IAM9d93ZCsR9 (normal speed, then slow speed).

When I use Chrome, I have normal speed everywhere.

I noticed that If I switch off flag "Threaded scrolling", I get slow speed everywhere.

I'm using last Opera version, macOS 10.13.6.

It's very annoying. I hope you'll fix it.