Imo and jason too, there are some JJ maps to delete for several reasons:
JJ_Mayhem - not optimized, lag
JJ_Montmelo moto gp - modified handling (there is a better version with infernus)
JJ_Sandking circuit - I'll upload the fun server version with better start position
JJ_Garden circuit - mod handling and bad optimization
JJ_Indoor minicircuit - just delete this shit
JJ_Montseny nrg500 - another versions of this same map
JJ_Montseny2 - lag, bad one
JJ_Quantumn circuit audidrift - too hard for noobs
JJ_RedBullAirRace round1 - the people just leaves the server with this one
JJ_RedBullAirRace round2 - same reason as round1
JJ_SiK_Halloween - is too dark and bad optimized
And there are the JJ_Super SiK Kart series... Idk what to do with them, they have modified handling, delete them if you think that it's necessary.