Hi Paul,

I don't use any particular fonts, just the default settings. The font changes depending on the file. I have the font size adaptation setting enabled, and that's all.

I'll try the trick you linked when I have some past-time for troubleshooting, thanks.

I also had the following issue:

tam.proz.com/.../259903-slowing_down_with_large_font_adaptation.html

(note that the original post is not mine)

PS. The video obviously doesn't fully present the severity of the issue, but the slowdown is evident at a glance in "real world". Also, text input lag increases A LOT.

Adrian Komiński 

File -> Options -> Editor -> Formatting Display Options -> Show all tags but do not show formatting

That will use the default Studio font for whatever your target language is.  All explained in the videos.

I'm currently testing with Arial Narrow with the "show tags but no formatting" setting to see if there is improvement, I'll keep you posted.

I know the videos aren't enough to explain anything, but they are - hopefully - enough to prove I'm not bullshitting you and for the issue to be potentially treated seriously by your team.

This might be hardware-related indeed, but Microsoft Surface Pro (2017, i5) is not a product from Mars, so hopefully it is/will be "supported". It runs on regular Windows 10.

Just made a test that proves definitely a MASSIVE lag difference between Arial Narrow and Arial with the project that I'm currently doing (just a regular original .docx contract, text only). I changed the fonts several times and there is 100% reproducibility - with Arial there is a massive lag when switching b/n segments, which pretty much goes away after switching to Arial Narrow. With Arial it feels like I'm on a 1990's laptop GPU.

Sure, my Surface only has a modest Intel GPU, but... it should handle TEXT, right?

Although, to be honest, I recently realized that there is a very similar phenomenon with MemoQ on this PC - when I decrease the font size to, say, 13 from 18 the segment switching and text input lag reduces immediately. So it might be something wrong with my PC (yet another silly issue with this godforesaken machine), but what exactly?! This you're probably not going to tell me, which I understand.

Nothing of this sort happens in MS Word or MS Edge, so it's not like my laptop has a problem with large fonts in general - it's just certain programming environments. But then again: MemoQ and Trados are quite a distance apart in these terms (programming platforms), aren't they?

Do try the font switching yourself in the meantime. I can't provide my current test file due to NDA.