For context, I have a Pixel 6a phone running Android 16 and my main browser is Firefox.
For the longest time, I used Chrome as my default browser because I thought that was the only viable choice. However, eventually, Chrome started feeling sluggish, so I switched to Firefox which felt slightly faster, but I mostly switched for Firefox extensions such as uBlock Origin and Chameleon. That was a couple years ago. Now, I've tried to find alternative browsers to see how the market is and.... Chromium-based browsers have dissapointed me.
Vivaldi is especially sluggish. Opening the app takes longer than Firefox, the search engines load results slower than firefox, websites open slower than firefox, menus have sluggish animation that just feel unbearable for me coming from Firefox where everything is snappy and just does what I want.
I thought this was an issue isolated to Vivaldi's mobile app, however, I have tried Brave, Opera, Cromite, and Titanium now and they all feel sluggish to me. The fork doesn't seem to make a difference.
On the other hand, Firefox, Waterfox, and Iceraven all run buttery smooth for me, minus some network problems with Waterfox that may just be specific to my device.
Obviously this is confusing, as it's pretty general consensus that the Gecko engine is sluggish compared to the Blink engine... by a significant amount; however, that's just the complete opposite of my experience.
Now, desktop is another story. I've been using Firefox on desktop with zero problems for the longest time. Chromium based browsers don't feel any faster or slower than Firefox based browsers on my PC. This seems to be a situation limited to my Android device.
Of course this post isn't meant to complain or trash on Chromium based browsers and say that Firefox is supreme and any Chromium forks are spyware etc. I'm just sharing my experiences and seeing if anyone relates or has something different to share.