Hmm so uncompressed lossless mode doesn't get past 10 fps on Old 3DS, seems like the Old 3DS cpu can't push past ~10 Mbps for its Wi-Fi. (Where as New 3DS can do up to 20 Mbps). (Bit of a bummer)
For New 3DS, the new lossless mode (not fully lossless, as it's still chroma subsampled and has bpp...