John, I tried streaming with audio. Even if I use a Wave format (uncompressed) I can only get 1MB/s. Tracktor has a buffer so unless a large file was deleted whilst recording it would be unlikely to have an effect.

That said it is now clear that the SSD does not schedule TRIM during a low activity period. Whatever is running when it executes will become unresponsive for however long the TRIM command takes to execute. If you work with large files that might become a problem.