I just checked, opened https://old.reddit.com/r/france :
less than 2 seconds, the page is fully loaded.
Tried https://www.reddit.com/r/france/: more than 4 seconds before the page is loaded.
Loading : https://old.reddit.com/r/france/comments/ccs5tx/emmanuel_mac...
is about 2 seconds. Loading: https://www.reddit.com/r/france/comments/ccs5tx/emmanuel_mac...
about 6 seconds.
The new reddit looks therefore 2 to 3 times slower.