Using soundfiler in PD I get an increase in the MSW meter in the GUI. Is there any performance loss as the MSW's stack up? I'm aware it may cause audio dropouts and glitches when the mode switch happens, but is there any downside to the number of switches occurred within a session?
Thanks

You may get a glitch when the mode switch takes place, but apart from that there is no performance issue associated with having a high number of past mode switches.