@EvgenKo423: I don't know all the ins and outs of the SH implementation, but I do know that above a certain size threshold (I thought it was 64KiB) SH will just alloc straight from the Windows API (VirtualAlloc, I think). SH doesn't do any other management of these blocks, so when LV asks SH to free them, SH immediately calls VirtualFree. This reduction in mem footprint should be visible in Process Explorer (or Task Manager). Another complication, though, is that a performance analysis done by our NI Bangalore colleagues found that VirtualFree was quite an expensive operation, so I believe LV'