The best way I found to reduce slowness is to get a faster SD card. Ever since I got my 64GB card for my EmuNAND, it's been a LOT faster. It loads almost instantly.
Hmm, interesting. I'll keep that in mind, thanks!
You need a faster SD. People complain of lag sometimes during games, even with their Gateway mSD, because their speeds are too slow. Note that this doesn't include lag related to playing Pokémon battles in 3D, as that comes down to shitty code optimization in an effort to release the game before Christmas and get more revenue.
If possible, try to get a class 10 one that has enough space for CIAs (if you want that). If your mSD cart already is huge, like mine (I have 64 GB class 10), then 8 GB will probably suffice (just make sure you get a fast one).
Yep as other people have already said, get a faster sd card preferably class 10 and you'll notice the difference.
No issues at all with my SanDisk SD card 3DS XL Pal 4.5 gateway emunand 9.4
Sometimes when i do the DS exploit, instead of booting into gateway mode I just get a black screen.. it only happens sometimes though
does anyone else have this issue?
Not exactly related to the topic, but this is 'normal'. Any Gateway on any 3DS has this issue from time to time. You should've seen when Gateway was still new, the chances of it properly loading were abysmally low.
It's pretty cringe worthy how it takes ages to load the menu even if you don't have any theme applied

You would think that if they couldn't implement themes without adding the annoying slowdown, they would make them an optional feature.
Say, wouldn't it be feasible for hackers or GW to find a way of disabling them?
I don't know if it's feasible right now. Apparently not everyone is noticing these slowdowns and they can be fixed by having a faster SD card. There are probably issues with a higher priority at the moment.
My 4.5 XL on 9.4 emunand takes 4-5 secs for the menu to fully loadup. My N3DS XL is pretty much instant.
so this is why they try to kill old 3ds. apparently the upcoming firmwares will probably be optimized for new 3ds.
Yeah my original 3DS is slow as a dog to turn on now. Very annoying. Just like Apple - We'll let all devices run any iOS, oh you're on old hardware, time to upgrade! Onto N3DS. Seriously just a business ploy imo.
Alright. Somewhere I'm not surprised. The N3DS is much more capable and I can indeed imagine that Nintendo is now simply optimizing the code for the N3DS and having the old 3DS as an afterthought.
I haven't noticed any slowdowns over previous firmwares. I'm using themes as well. If the SD card has anything to do with it, here's mine:
32GB SDHC UHS-I Class 10 SanDisk Ultra formatted to 64KB clustering.
I don't use an EmuNAND.
I assume you use a Sky3DS then?
I'd gladly give up theme's (I've even purchased some) to go back to 8.x. Games still work great, but the extra 15-25 seconds to boot is really annoying when it used to boot in less than 5.
I hear ya. I hear ya. I am contemplating using my 8.1 EmuNAND backup to go back to 8.1. I'll be losing some progress here and there but it might ultimately be worth it... What do you (or anyone else) think?
I wonder if this has anything to do with the size and or amount of free space on the card as well. I have read that larger SSDs and leaving about 25% free makes them much faster. Could be apples and oranges for all I know.
Not an unreasonable hypothesis. I think there might be some truth to this. Even on SD cards, things get fragmented, and the more full and more fragmented the SD card is, the more it has to seek for free spaces to write to and seek to find the right data.
Hm....I guess its about that time to install that 64gb class ten sd card I kept as a spare, or I can use the 32gb class ten. How easy is it to copy data over to the new sd w/o GW?
I'm pretty sure I was able to just copy/paste the data on a Windows PC from one to the other. I had to backup my 2GB SD card a month or two ago and transfer to a 16GB for an eShop purchase and I think that's how I did it. As for emuNAND and all that I'm not sure sicne I don't have one yet, but the DS part was copy/paste.
For the EmuNAND, you need to use EmuNAND tool. (Google/Search it. It's a thread here on GBAtemp.) You should backup the EmuNAND from your old SD card. Then format EmuNAND on the new SD card. (I know you said "without Gateway", but you do need Gateway for that step.) And then simply reinsert the EmuNAND backup to the new SD card.