pandoc --version
pandoc 3.3

pandoc +RTS -t -RTS -o test.md test.html
# <<ghc: 30556315048 bytes, 3666 GCs, 248986086/1293885312 avg/max bytes residency (13 samples), 2985M in use, 0.001 INIT (0.001 elapsed), 2.773 MUT (2.511 elapsed), 2.892 GC (3.461 elapsed) :ghc>>

pandoc +RTS -t -RTS -o test.docx test.md
# <<ghc: 105686485256 bytes, 12695 GCs, 434087025/1466902032 avg/max bytes residency (19 samples), 3435M in use, 0.002 INIT (0.002 elapsed), 10.349 MUT (10.101 elapsed), 7.732 GC (8.308 elapsed) :ghc>>

pandoc +RTS -t -RTS -o test.docx test.html
# <<ghc: 76105089872 bytes, 9099 GCs, 489199853/1886265928 avg/max bytes residency (20 samples), 4350M in use, 0.002 INIT (0.002 elapsed), 8.025 MUT (7.772 elapsed), 9.163 GC (10.023 elapsed) :ghc>>