I keep virtually all programs on my SD card and have not noticed any slowdown. The main programs I keep in main memory are: Sprite Backup, Kaspersky Security, and storage utilities that do things to the SD memory.
Précision : inversement à ce que je disais le 30/11 (un peu plus haut) cette version 0.99c marche très bien, sans aucun blocage ni autre pb de mémoire.