To start this off, Saving and Quitting is a way to quickly warp to one end of a level that can be useful. Although you don't actually save, its just called that. it's a very easy trick that is now a lot more useful due to the new fix that stops the game crashing on quits as long as the PC is not under load. any S+Q's may or may not break the sponsor challenge cycle. the first dino S+Q however will have Beverly hills sponsor challenges remain the same but all else will change. These S+Q strats will be placed in order of the game

After Dino Head, S+Q immediately to get to bus. do 3rd hollywood graf mission on the way to buy dino head in skate ranch split.

After Boone, on the way to skate ranch. wait for game to lag in the tunnel (about halfway) then S+Q. (MAKE SURE YOU HAVE COMPLETED 6 SPONSOR CHALLENGES otherwise the sponsor challenges in Hollywood will be different)

After Mr. D Mission (the one that unlocks downtown) S+Q to hollywood bus and take it to downtown

Do Bike missions after amjam, keep the bike, skate in tunnel to downtown and S+Q after lag spike, you will warp to downtown. (this will save time not only route wise, but also the 3s it takes to get off bike)

Once again in the Beverly Hills to Skate ranch tunnel, exact same as the first one

After the flatland comp, go through the elevator and S+Q when you do so

After Alva manual mission, S+Q (you have to wait about a second after mission completion otherwise the alien suit wont be available in hollywood)

when Oil Rig logo pops up while on boat, S+Q. make sure you hop in the water in between land and the buoy line otherwise you will respawn back up top

when santa monica POI's appear on compass in tunnel on the way to santa monica from oil rig in tunnel

after talk with cholos after Downtown graffiti S+Q to bus

after black widowz tattoo, S+Q to bus

after cholo bike mission, S+Q to bus to east la

after delivering the money to Joey B, S+Q to hollywood bus

after Daewon pro mission (only worth if combo is done on the ledge daewon tells you to do it on)

after Paul Rodriguez pro mission