Skip updates for insignificant deltas and update the formattor

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DMD perf check

Metric	Base	PR	delta
compile hello.d (instr)	215.8 M	215.8 M	0.00%
compile hello.d -O (instr)	234.3 M	234.3 M	0.00%
compile Phobos (instr)	5,080.7 M	5,080.7 M	-0.00%
dmd binary size (stripped)	6.88 MB	6.88 MB	0.00%
hello binary size	0.72 MB	0.72 MB	0.00%
peak RSS (compile hello.d)	44 MB	44 MB	-0.08%
peak RSS (compile Phobos)	634 MB	632 MB	-0.25%