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Has anyone else noticed that the refresh rate of the Opera UI is locked at 60Hz/FPS? Using Opera on a high refresh-rate monitor is really jarring when you're using to anything higher.
This issue is only present in Opera. Other browsers I've tested with are Firefox, Vivaldi, Chrome, Brave and Edge, of which all run smooth!
Are there any CLI switches that remove this limitation?
Has anyone else noticed that the refresh rate of the Opera UI is locked at 60Hz/FPS? Using Opera on a high refresh-rate monitor is really jarring when you're using to anything higher.
This issue is only present in Opera. Other browsers I've tested with are Firefox, Vivaldi, Chrome, Brave and Edge, of which all run smooth!
Are there any CLI switches that remove this limitation?
Most browsers annoyingly add spacing above the tabs when not maximised, it actually wasn't until I used Edge for a few weeks that I realised how much I dislike the spacing. Though it has become more noticeable since I neither use a 1080p monitor at home or at work.
Times are changing, and Edge may look better aesthetically than Opera, Chrome and Firefox but it doesn't compete when it comes to and features and more importantly customisation which is why I believe that users should have a choice about how their browser looks and feels.
I prefer to avoid the top space in tabs, easly to switch between tabs.
You can use Opera maximized.
I could, but using Opera maximized on anything above a 1080p resolution is completely wasted, most websites don't utilise the space. This forum is a good example; the content width is only 900 pixels, why would I maximise my browser when 1660 pixels could be used for other windows? (I use 2560x1400 resolution btw). This is a problem that only gets worse the higher your resolution is.
As I said in my original post, I tile my windows to maximise the effective space. I'll have Opera snapped to the right of the screen and on the left I'll have a code editor, a terminal window and sometimes Spotify. When I tile like this often using Windows Key + Directional Arrows, then the wasted space above the tabs in my browser are really noticeable.
I prefer to avoid the top space in tabs, easly to switch between tabs.
Another valid reason, I often miss-click the wasted space when attempting to switch tabs.
Even without the spacing above the tabs, there is spacing between the "New Tab" button and the "Tab Menu" button that I could use if I wanted to drag my window
What if you have lots of tabs opened?
There is still always a space between New Tab and Tab Menu buttons, try it yourself. 
Example: http://imgur.com/a/ZGH9U
Even without the spacing above the tabs, there is spacing between the "New Tab" button and the "Tab Menu" button that I could use if I wanted to drag my window. I understand this is a "design feature" for your everyday user but it would still be nice to have the option.
This is achievable even in your younger brother "Vivaldi" using simple CSS (#tabs-container.top{padding-top:0px !important;}), I understand the technology is different but heck what a nice feature!
I really like the Reborn UI redesign but something really irks me and that is the 10-20px spacing above the tabs in the title bar. I have 1440p resolution monitors at work and at home and often tile my windows on screen to maximise productivity and screen estate.
If I maximise the Opera window then the spacing goes away, but I don't understand why this isn't the default behaviour as the spacing is wasteful and really unattractive. This is actually something Microsoft Edge does well in my opinion.
Are there any browser options or flags I can set to modify the spacing behaviour?
Many thanks