improve: apply `tachyon` optimizations(2 & 5) #1085

Job	Run time
Test on ubuntu-latest with basic features	3m 25s
Test on windows-latest with basic features	8m 46s
Bitrot check	1m 31s
Test on macOS-latest with basic features	3m 10s
Build target wasm32-unknown-unknown	1m 46s
Test on ubuntu-latest with all features	4m 2s
Intra-doc links	38s
Build target wasm32-wasi	1m 43s
Test on windows-latest with all features	9m 3s
Test on macOS-latest with all features	3m 36s
Run the examples	2m 1s
Rustfmt	16s
	39m 57s

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