Two Questions:

1. When I watch speedruns on twitch, every time they enter the nether, they are always very close to a Bastion, and it pops up in their entity screen very quickly. It feels like that is always the case for these streamers, but when I speedrun, the nearest bastion is something like 700 blocks away. Same thing with ravines. Do you know why this might happen? I run in 1.16.1, just like others.

2. Are there any mods that are allowed that can make the game less laggy?

1. Skills issue, I mean, luck (kinda). Top speedrunners (just sub 13 runners) reset a lot, like, a WHOLE LOT. When they do an e-ray and see that there's no bastions nearby, what they do is instantly reset the run. So when you watch the stream, the runs that have bastions nearby will obviously be seen more.

2. Mods? Uhh, look at the resource at https://redlime.github.io/MCSRMods/