@yanta ahh yes that shit
Dont think its fair to blame opera for that though

I used to see this too
but it got fixed ages ago i think
i dont see it now

I have never seen this behaviour
what do you mean ?

https://addons.opera.com/en-gb/extensions/details/tabs-to-the-front/
try this extension works for me

https://fossies.org/windows/www/Opera_Developer_59.0.3218.0_Setup_x64.exe/ is that it ?

More constructive help maybe
learn to use this so you can see what its up to while its "just sitting there"

https://docs.microsoft.com/en-us/sysinternals/downloads/procmon

@icearity Its just a sign of the times im afraid. programmers/script kiddies nowadays consistently fail in any optimisation. rather blaming you for your crappy pc instead. On their end on their Quantum pc @ -1 Kelvin with 1024 Terrabytes of ram and a (list is endless lol ) it works instantly and all is well.
Im not saying i blame anyone this has been happening since computers were discovered.
It could be:
a slow hard drive,
a bad file somewhere,
a slow website/extension taking too long to handshake

it could be anything

if as you say similar browsers are instant
and i mean similar not chalk n cheese like firefox
then use the alternative
but i wouldnt hold your breathe for any fix of this nature to arrive...
as some Roman idiot once said...
"Caveat emptor" 0r
"noli illegitimi carborundum"

Latest version is 58.0.3135.53
try a reinstall should
fix it up

ahh now i see it yes doesnt bother me
it was the in parentheses bit that threw me
i dont see that