Long loading times with MAME2003+ on 2DS/3DS

Hi everyone,

since RetroArch 1.9.1 the MAME2003+ core takes unbearable long to load any game ROM. I tried a few smaller ones like Klax, Wonderboy and Enduro Racer - all the same. I’ve tested these on a New 2DS and New 3DS console also with the same result. Searching for this issue on the web did not lead to any solution. Apparently, I’m the only one who’s having this problem (or at least noticed it). Is there a secret setting or anything else I’m missing?