To speed up the display of the coins of interest for an exchange, I recommend setting:
1) My Wishes -> Hide coins and banknotes I don't wish
This is because clearly if a collector has defined what he does NOT want his display is useless
2) Collectible types -> Coins
This is because most collectors are on Numista for coins
3) My collection -> Show only coins and banknotes I don't own
I believe that most of those who want to trade select this type
Thank you