Running cache 5.0.21 64 bit on Windows server 2016 in virtual environment. Trying to understand why every single process disk read speed (simple sql data walks) caps  around ~20MB/s, however 2 paralell such tasks on different data areas can reach 19MB/s each, four - 17MB/s each, that is 70MB/s total, etc. Also simple copy file to nul on that system reach ~400MB/s.

What can keep single query on idle system from reaching for example 200MB/s? Virtualization? Windows? Cache? Processors are below 1-3%

Any insights, news, alternatives or experience about sequence pattern querying like with Oracle's MATCH_RECOGNIZE, more declarative, less simple direct COS way? Both obvious solutions (shadowing data to oracle cloud or implementing MATCH_RECOGNIZE compiler in COS from scratch) seem big overkill. Do Intersystems have plans to adopt this "2007 ANSI standard proposal" and "SQL:2016 standard"

My problem is regular need to do analytics on medical lab data dynamics and correlations, and while its always doable by COS and multiple SQL statements, such handcrafting for every new hypothesis/idea or