Tsuta Intro Cutscene Skip
Explanation
After entering Tsuta Ruins for the first time, there is no immediate intro cutscene, unlike most areas. Instead, the cutscene's trigger is set further into the main room of floor 1. Because this cutscene starts with a particularly long unskippable camera pan (over 18 seconds), it is very helpful to skip it.
Via KT's
In NG+, after entering the dungeon, one can immediately KT up to floor 2 through the Rejuvenate-able bridge. This brings Ammy almost directly to the triple Devil Gate room, skipping most of the dungeon.
Demonstration: https://youtu.be/xQJmnMdIIww?t=2074
Without KT's
In NG, the cutscene is skipped by doing a wall-jump on the right-most wall, ahead of the trigger. It is then possible to just clear the trigger by doing an air-tackle over the large vine/root that separates the entrance from the main room.
Demonstration: https://twitter.com/GiantCookieJar/status/1171153618747252737?s=20