Depends, but for the most part, considerably faster. I'm of the opinion that most modern games don't respect your time, nor have worthwhile side content. No point beating around the bush, if I do a few side missions and they're just fetch quests, or I get no worthwhile rewards for exploring, I'm just gonna beeline the main missions without even giving that stuff a second thought. RPGs are the big ones though. Generally the longer the game, the more I'm able to cut off.
For example, recently finished Kingdom Hearts in about 16 hours, a little over half of the average, and even then I felt like I screwed around a lot more than I normally would. Not even a whole lot of extra things to do on a blind first run so I'm wondering where all those extra hours are coming from.
Did Xenoblade DE + Future connected in 35-40, where the average seems to be about 50 just for the main game. However XC2 took me 57 playing the same way, which is pretty close to average oddly.
Beat Yakuza 0 in about half the time, and Kiwami in 2/3 the average time. Granted I didn't do many side stories at first because I enjoyed the story so much I couldn't imagine taking my attention off it and doing anything else until I'd experienced it's conclusion.
Platinumed Death Stranding in like 70 hours, and FF7R in 60, both 20-30+ less than the average completionist time.
But then with Fromsoft games, I explore every nook and cranny, essentially doing a 100% first run and my finish time is normally the average for a base run, not doing any extra stuff. So the games I play the slowest I still beat considerably faster.