Use GetSystemTimeAsFileTime() instead of GetTickCount() to infer time references

[avengerx]

The GetTickCount() function has the risk of overlapping every 49 days. Alternatively there's GetTickCount64(), yet GetSystemTimeAsFileTime() should be much lighter to the driver, if feasible to replace the current time reference.

It basically is used to determine time differences for the duration of effects run.

[avengerx]

It looks like relying on rdtsc() would be even faster.

• VS C++ shorthand
• a sample with a benchmark using a handcrafted query (for that to work in VS you need to replace asm with __asm)

As it amounts to CPU clock ticks since last reset, it may be difficult to approximate to actual milliseconds or any other wallclock variation.