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Hmm, on my test case, rc3 seems to consistently increase runtime by
about 10% compared to rc1.  [I didn't test rc2, so maybe the changes
there are the reason.]

A bit mystifying as rc1 was noticeably faster even when matching rc3's
memory usage...


Lua variant             Scene def CPU           Total CPU     Elapsed   MaxRSS
* pause=100-stepmul=200
lua5.1.5           153.2~0.8s (+2.5s)  157.4~0.9s (+2.7s)  162.5~2.5s  1,312MB
lua5.2.1-rc1       124.9~0.6s (+3.1s)  129.3~0.5s (+3.2s)  137.2~3.0s  1,885MB
lua5.2.1-rc3       130.4~0.8s (+3.2s)  134.7~1.0s (+3.4s)  146.5~4.3s  1,902MB
* pause=100-stepmul=300
lua5.1.5           157.7~1.1s (+2.6s)  161.9~1.1s (+2.8s)  165.9~2.0s  1,312MB
lua5.2.1-rc1       125.7~1.2s (+2.7s)  130.1~1.1s (+2.8s)  135.1~1.2s  1,709MB
lua5.2.1-rc3       129.5~0.8s (+3.1s)  133.7~0.9s (+3.2s)  142.3~2.8s  1,833MB
* pause=100-stepmul=500
lua5.1.5           170.6~0.7s (+2.3s)  174.9~0.7s (+2.6s)  177.9~1.0s  1,312MB
lua5.2.1-rc1       124.9~0.3s (+2.5s)  129.3~0.3s (+2.7s)  132.4~0.7s  1,656MB
lua5.2.1-rc3       129.3~0.7s (+3.0s)  133.7~0.7s (+3.2s)  140.1~1.3s  1,649MB
* pause=200-stepmul=200 (default)
lua5.1.5           136.9~0.9s (+2.6s)  141.3~1.0s (+2.8s)  146.4~2.0s  1,653MB
lua5.2.1-rc1       125.4~1.3s (+3.2s)  129.6~1.3s (+3.4s)  139.6~1.7s  2,056MB
lua5.2.1-rc3       130.0~0.8s (+2.9s)  134.3~0.9s (+3.1s)  141.4~0.6s  1,900MB
* pause=200-stepmul=300
lua5.1.5           134.8~0.5s (+2.8s)  139.0~0.5s (+2.9s)  145.4~2.3s  1,756MB
lua5.2.1-rc1       124.9~1.0s (+2.7s)  129.2~1.0s (+2.8s)  137.6~1.2s  2,088MB
lua5.2.1-rc3       129.6~0.6s (+3.1s)  133.8~0.7s (+3.2s)  141.6~0.6s  1,991MB
* pause=200-stepmul=500
lua5.1.5           135.3~1.1s (+2.5s)  139.5~1.1s (+2.7s)  143.9~2.1s  1,749MB
lua5.2.1-rc1       123.5~0.9s (+2.9s)  127.7~0.9s (+3.0s)  135.6~2.3s  2,060MB
lua5.2.1-rc3       127.1~1.3s (+3.0s)  131.4~1.3s (+3.2s)  137.9~1.8s  1,879MB

* 5 samples
* CPU times are in the form "user (+sys)"; standard deviation follows "~"

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