optimize(IO): reduce memory usage during reading data from files to F… #466

Job	Run time
Linux	3m 58s
FreeBSD	7m 33s
MacOS	15m 43s
Linux build test (ubuntu-22.04, gcc, g++, ON)	1m 1s
spellcheck	10s
Linux build test (ubuntu-22.04, gcc, g++, OFF)	1m 0s
Win32	8m 49s
Win64	2m 29s
Linux build test (ubuntu-22.04, clang, clang++, ON)	1m 22s
Linux build test (ubuntu-22.04, clang, clang++, OFF)	1m 11s
Linux build test (ubuntu-22.04, musl-gcc, musl-g++, OFF)	56s
Linux build test (ubuntu-20.04, gcc, g++, ON)	1m 24s
Linux build test (ubuntu-20.04, gcc, g++, OFF)	1m 9s
Linux build test (ubuntu-20.04, clang, clang++, ON)	1m 35s
Linux build test (ubuntu-20.04, clang, clang++, OFF)	1m 23s
Linux build test (ubuntu-20.04, musl-gcc, musl-g++, OFF)	1m 26s
Release	0s
	51m 9s

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