PLEASE see these videos (in one) for an idea. I have seen very thin line glitching in lower screen when I move left and right in twilight menu games selection screen too. I have played GBA games through GBARunner3 a lot too and not saw any ever, but they're not graphically intensive either.
Decrypted roms if it matters. I use them for some reason, but I'll explain if you ask.
nds bootstrap v2.8.2. twilightmenu++ v27.17.2.
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