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Re:Hermes – A small JavaScript engine optimized for running ... by writepub on Thursday July 11, 2019 @01:01PM (#20413212)
From your numbers:

1. runtime memory reduction: ~25%

2. Boot time reduction: 20%

3. Time to interaction reduction: 20%

For apps with significant boot times, and runtime memory consumption, this is valuable.

Re:Hermes – A small JavaScript engine optimized for running ... by r1nkgrl on Thursday July 11, 2019 @03:06PM (#20414486)
For apps with significant boot times, and runtime memory consumption, this is valuable.

This assumes that the reductions are purely proportional to the total and not (at least partially) fixed.