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without-gc-delay



Why not cover the ground and call it:

without-system-delay

Evaluates form and returns what that form returns, but prevents (as far as
is reasonable for the implementation) delays due to periodic system
activity not normally under the control of the user (for example, garbage
collection).

Note:  a common use of without-system-delay is with an embedded time form,
       to obtain reasonably consistent timings without the impact of
       major systems activity.

(The reason I extend the name is because of systems which perform periodic
housekeeping for e.g. network and file-system management, which can usually
be delayed).
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