Unfortunately, there's not much to be done in terms of performance. Luma does have some options to help it, but those are exclusive to the New models. Did you happen to upgrade the SD card recently? Bigger cards come with longer boot times.
As for the game card issues, try this: Grab a card, load the pins up with a bunch of isopropyl alcohol, and push it in and out of the slot several times to clean any dirty card slot pins.
Now, further reading:
[link|https://3ds.hacks.guide|3ds.hacks.guide] has modding instructions and basic info, but I assume you've been there already
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[link|https://wiki.hacks.guide|wiki.hacks.guide] probably has everything most users would ever want to know, from alternate exploits to SOAP transfers
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[link|https://wiki.hacks.guide|wiki.hacks.guide] probably has everything most users would ever want to know, from random homebrews to SOAP transfers
[link|https://www.3dbrew.org/wiki/Main_Page|3dbrew] covers a more technical side of things, and starts getting into homebrew development
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(One more thing since koppie mentioned factory resetting. That might work, but it will of course shuffle the encryption key and render your SD contents unusable. That part can be worked around though)
Unfortunately, there's not much to be done in terms of performance. Luma does have some options to help it, but those are exclusive to the New models. Did you happen to upgrade the SD card recently? Bigger cards come with longer boot times.
As for the game card issues, try this: Grab a card, load the pins up with a bunch of isopropyl alcohol, and push it in and out of the slot several times to clean any dirty card slot pins.
Now, further reading:
[link|https://3ds.hacks.guide|3ds.hacks.guide] has modding instructions and basic info, but I assume you've been there already
[link|https://wiki.hacks.guide|wiki.hacks.guide] probably has everything most users would ever want to know, from alternate exploits to SOAP transfers
[link|https://www.3dbrew.org/wiki/Main_Page|3dbrew] covers a more technical side of things, and starts getting into homebrew development