By default Vim is compiled without any compiler optimization.  Then
it becomes very slow under certain circumstances (for example, when
using netrw to view directory content).

The Vim installation documentation says that we can provide optimize
options in Makefile variable:

    make CFLAGS="-O2"

The autoconf variable (CFLAGS="-O2" ./configure ...) would be ignored.

And, use -O2 could stop the warning "_FORTIFY_SOURCE requires compiling
with optimization (-O)".
-- 
Xi Ruoyao <[email protected]>
School of Aerospace Science and Technology, Xidian University
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