Hi Jon,
With a RAM drive and StarTools, you should be able to notice some speedups in between modules (e.g. when Tracking is doing the backward/forward propagation).
The speedup is quite dependent on the size of the image you are processing, how complex your workflow has been (this aspect is more noticeable in ST 1.6 which utilises a more optimised storage scheme for Tracking data), as well as single-core CPU speed. The latter is due to on-the-fly compression and decompression of the Tracking data. If the CPU becomes the bottleneck rather than the storage throughput, improvements in throughput will have less of an effect. It's one of those "YMMV" things.
If you run Linux, try mounting your tmp folder using tmpfs - it automatically uses up RAM for the RAM drive until a certain limit, then moves over to using swap.
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