FWIW, Win10 & Strawberry:

v5.32.1
tempfile.txt is size 29 Mb
0.115239 read lines from disk and do RE (32571 matches).
0.676642 read lines from in-memory file and do RE (32571 matches).

v5.38.0
tempfile.txt is size 29 Mb
0.156708 read lines from disk and do RE (32571 matches).
0.628221 read lines from in-memory file and do RE (32571 matches).

v5.26.3
tempfile.txt is size 29 Mb
0.122374 read lines from disk and do RE (32571 matches).
0.671405 read lines from in-memory file and do RE (32571 matches).

v5.16.3
tempfile.txt is size 28 Mb
0.119628 read lines from disk and do RE (32760 matches).
0.057724 read lines from in-memory file and do RE (32760 matches).

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In reply to Re^4: RE on lines read from in-memory scalar is very slow by Anonymous Monk
in thread RE on lines read from in-memory scalar is very slow by Danny

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