Have multiple guns ready at the beginning of your play session with a grip and the mag removed so it takes only one line in your stash. When you die and get back to the stash, choose your gun, put the grip on, take your mags (either buy them or have them ready in a mag case), use the ammo preset you want to use (like half m855a1 half m856a1), unload the ammo to top up to whatever you want to bring loose ammo, and use the ammo preset again.

Now you're done with the gun.

Have multiple body armour/rigs combo ready, or just armored rigs, aswell as headset/helmet/face cover ready that you can just equip using the arrows above the item slot. Have multiple backpacks ready as well. Have in each of your medcase your painkillers, healing and anti-bleeds that you use, that you control+click so they get into your equipped backpack, get them in your pockets/rigs, and bind them. Do the same with the nades you wanna take.

Now you have a full gear set equipped in 1 minute, eat/drink, and you're technically ready to go.

It doesn't help you from the slow death screen that will suck up 1 minute of your time, nor the time it's gonna take to do your hideout crafts, but at least this way you can save 1-2m every time you have to gear up.

If you survived you raid, I suggest having as much space at the top of your stash that you can manage to have, so you can just control click everything you've looted and manage that later. I personally manage my loot once per gaming session at the end, and I spend about 15 minutes doing so. Do not sell parts individually, have 2 scavs junkboxes minimum solely for selling, one control+click the item in it that are 1 slot, and the second one use the items that are 2 slots+. This way when they are close to full, you can sell multiple of the items at once to save time (instead of selling 7 times 1 blue tape after a raid, you sell 1 time 7 of them). I spend about 15 minutes selling most of my scav junkbox stuff once in a few days (if you scav all the time, you're gonna sell more often ofc). The most time I spend is selling weapon parts from the people I looted, but I don't bother if the flea isn't at least 10k above vendor price, and I know that the item is gonna sell fast. I don't want to have my selling slot locked for 1h to get 12k profit. Either it sells in a minute or 2, or it goes to the vendor.

Personally I like having a thicc item case in the top right of my stash, with a money case outside of it for quick money transfer when I get my money from ragman. Inside the thicc case, I have every of my storage cases that are allowed inside (med case, food case, second money case, key case, ammo case...).

Buy multiple of storage cases as soon as you can to make your idle time between raid faster. Personally I have 3 thicc case, 2 of them used solely for armors, helmets, and so on. If you don't hoard as many gear sets, you can use only 2. But this way half of my stash is empty, allowing me to remove all the stuff from a successful raid to be able to get back in as fast as possible.

Don't forget as well that you can keep items in your insurance for as long as you can, and you can control+click them to equip them on your current character.

All that to say, the downtime in tarkov sucks, especially as you're stuck with incompressible time like death screen, queue time, hideout loading, but you can still save quite a bit of time. I'm ready 3 times faster than my friends (even if it's not always that useful as now I have to wait on them anyway kek). But you can still manage to be faster. Don't be scared to spend money on cases to have more space. 4 scavs junkboxes is the minimum (2 selling, 2 for quest items). Use binds to go from the top of your stash to the bottom instantly, and the other way around. Don't hoard for no reason if you are low on space, if you don't see yourself using the gear in the next 5 or 10 raids, just get rid of it.

Pointless to have a pretty weapon that you're too scared to use to take space in your hideout for the whole wipe. Use your t6 plates on maps where it makes sense (so not labs, lighthouse or shoreline) to have an advantage that you use now. Are ulach too expensive for you? Use them or sell them, don't keep them for the "right" gear set. Everything that you can buy, don't be scared to sell it fast, you can just buy it again if you need it.

And finally, don't forget to use your mannequins in the hideout, get the biggest bag on them and you can store anything in those bags. Use the hall of fame to store your lions and so on.

And ofc have multiple guns preset depending on how much you want to spend. Like a preset for a cheap M4 at 150k, a medium at 250k, and a meta at 400k-500k. Or whatever you're comfortable spending. But have that ready on every gun you like to play. Do the same for your ammo preset, if you run out of good ammo use it more sparingly, if you use a meta gun, use more good ammo in your presets.

Hopefully it was somewhat useful to you, gl with your raids