RetroArch for 3DS: cap32/crocods too slow!

[pmeier]

Current RetroArch on 3DS is too slow to play CPC games (cap32 and crocods).
Old issues say that RetroArch 1.6.6 fixed such a problem, but I could not find this version.
I only found 1.6.7 which lacks cap32/crocods, but I tried snes9x which is also much too slow.

Has anyone an old playable version of RetroArch? Or any CPC emulator for 3DS?

Using crocods for DS on 3DS is of course working, but I want the full 3DS resolution!
Please!!!!!