JoeNotCharles

The opening act of The Sith Lords gets a bad rap. It's actually very atmospheric and gives a great introduction to the themes of the game (especially if you install a skin like A Darker Peragus). It only has one real problem: it's too long and repetitive. Especially since TSL rewards replaying to try different paths, it can be a chore to get through at the beginning of a new game.
This cuts out about a quarter of the length without sacrificing any plot points, by removing a large section that doesn't reveal anything new, and changing some frustrating level design decisions that add delays and backtracking without adding meaningful choices. This should give new players a better opening experience to the game, as well as letting experienced players get through the first segment faster. The full list of changes is below, if you want spoilers:
I recommend also installing my Harbinger Arrival: Free Cam mod, which speeds up a long unskippable animation sequence. It's separate so that it can be installed on its own for people who don't want the more drastic changes in Streamlined Peragus.
Compatibility
Requires TSLRCM. Tested with the Full Mod Build and the Spoiler-Free Mod Build. Install this after them. Also compatible with my Harbinger Arrival Tweaks. Install them in any order. Modifies the map of 103PER (Fuel Depot), so this will conflict with any other mod that replaces 103per.lyt or 103per.vis. Known Bugs (spoilers)
Links
KOTOR2 Spoiler-Free Mod Build: https://www.nexusmods.com/kotor2/mods/1186 Malkior's A Darker Peragus REDUX: https://deadlystream.com/files/file/722-a-darker-peragus-redux JoeNotCharles' Harbinger Arrival Tweaks: https://deadlystream.com/files/file/2518-harbinger-arrival-tweaks Formerly packaged separately at https://deadlystream.com/files/file/2449-harbinger-arrival-free-cam and https://deadlystream.com/files/file/2448-harbinger-arrival-restore-movie.

NOTE: this is now packaged together with my other Harbinger Arrival mod as Harbinger Arrival Tweaks.
TSLRCM replaces the single movie when the Harbinger arrives at Paragus with a 3-step sequence: a movie, an in-engine cut scene, then another movie. This puts the original movie back while keeping all the other TSLRCM changes.
Why do that?
The main reason to prefer the in-engine cut scene is that the original movie looks awful - space shots of the ship arriving can get away with a fuzzy low resolution, since they're so different from the gameplay, but the middle section really suffers by comparison. But, Naelavok's Remastered (Upscaled) Cutscenes improve the movie quality enough to compete with the rendering.
PapaZinos' Harbinger Arrival Performance Enhancement mod does a lot of great work to make the cut scene smoother and fixes a lot of glitches, but on my machine (with the upscaled movies) there's still a loading delay when switching from a movie, to an in-engine rendering, back to a movie. The single movie has smooth fades, so it has better pacing for this important scene. I still recommend the Performance Enhancement mod, though, because it fixes a lot of other glitches in the sequence, and it greatly improves another brief cut scene after the Harbinger arrives. To make sure PapaZinos' hard work on the in-engine rendering doesn't go to waste, I used it to add a little improvement to that cutscene as well...
Compatibility
Not needed with vanilla TSL. Works with TSLRCM with or without the Harbinger Arrival Performance Enhancement. Tested with the KOTOR2 Spoiler-Free Mod Build, but it should work with the Full Mod Build too.
Install this after TSLRCM and Harbinger Arrival Performance Enhancement.
Also compatible with my Harbinger Arrival: Free Cam mod. Install them in either order.
Links
Naelavok's Remastered (Upscaled) Cutscenes: https://www.nexusmods.com/kotor2/mods/1066 PapaZinos' Harbinger Arrival Performance Enhancement: https://deadlystream.com/files/file/2027-harbingers-arrival-performance-enhancement-for-tslrcm KOTOR2 Spoiler-Free Mod Build: https://www.nexusmods.com/kotor2/mods/1186 JoeNotCharles' Harbinger Arrival: FreeCam: https://deadlystream.com/files/file/2449-harbinger-arrival-free-cam

NOTE: this is now packaged together with my other Harbinger Arrival mod as Harbinger Arrival Tweaks.
Unlocks the camera during the Harbinger arrival animation, so you can have the eerie experience of walking alongside the huge ship as it pulls closer. I think it's more ominous this way (and as a bonus, if you're replaying and don't want to watch again, you can rush through without waiting for the whole animation.)
Compatibility
Tested with Vanilla KOTOR2, TSLRCM and the KOTOR2 Spoiler-Free Mod Build, but it should work with the Full Mod Build too.
Install this after TSLRCM and anything else that modifies the Harbinger arrival sequence, such as the Harbinger Arrival Performance Enhancement (which is included in the mod build).
Also compatible with my Harbinger Arrival: Restore Movie mod. Install them in either order.
Links
KOTOR2 Spoiler-Free Mod Build: https://www.nexusmods.com/kotor2/mods/1186 JoeNotCharles' Harbinger Arrival: Restore Movie: https://deadlystream.com/files/file/2448-harbinger-arrival-restore-movie

Contains two changes to the Harbinger docking sequence on Peragus. Install either or both, your choice:
Harbinger Arrival: Free Cam
Unlocks the camera during the Harbinger arrival animation, so you can have the eerie experience of walking alongside the huge ship as it pulls closer. I think it's more ominous this way (and as a bonus, if you're replaying and don't want to watch again, you can rush through without waiting for the whole animation.)
Harbinger Arrival: Restore Movie
 
TSLRCM replaces the single movie when the Harbinger arrives at Paragus with a 3-step sequence: a movie, an in-engine cut scene, then another movie. This puts the original movie back while keeping all the other TSLRCM changes.
Why do that?
The main reason to prefer the in-engine cut scene is that the original movie looks awful - space shots of the ship arriving can get away with a fuzzy low resolution, since they're so different from the gameplay, but the middle section really suffers by comparison. But, Naelavok's Remastered (Upscaled) Cutscenes improve the movie quality enough to compete with the rendering.
PapaZinos' Harbinger Arrival Performance Enhancement mod does a lot of great work to make the cut scene smoother and fixes a lot of glitches, but on my machine (with the upscaled movies) there's still a loading delay when switching from a movie, to an in-engine rendering, back to a movie. The single movie has smooth fades, so it has better pacing for this important scene. I still recommend the Performance Enhancement mod, though, because it fixes a lot of other glitches in the sequence, and it greatly improves another brief cut scene after the Harbinger arrives. To make sure PapaZinos' hard work on the in-engine rendering doesn't go to waste, I used it to add a little improvement to that cutscene as well...
Compatibility
Restore Movie isn't needed with vanilla KOTOR2. Free Cam works with it.  Both work with TSLRCM with or without the Harbinger Arrival Performance Enhancement. Install this after both of those, and anything else that modifies the Harbinger arrival sequence. Tested with the KOTOR2 Spoiler-Free Mod Build (which includes the Performance Enhancement), but it should work with the Full Mod Build too. Other Recommended Mods
KOTOR2 Spoiler-Free Mod Build: https://www.nexusmods.com/kotor2/mods/1186 PapaZinos' Harbinger Arrival Performance Enhancement: https://deadlystream.com/files/file/2027-harbingers-arrival-performance-enhancement-for-tslrcm Naelavok's Remastered (Upscaled) Cutscenes: https://www.nexusmods.com/kotor2/mods/1066 Malkior's A Darker Peragus REDUX: https://deadlystream.com/files/file/722-a-darker-peragus-redux JoeNotCharles' Streamlined Peragus: https://deadlystream.com/files/file/2470-streamlined-peragus