Google's Noto Sans CJK JP contains 9 font files, each about 13MB. You can edit fonts to subset glyphs or glyph sets you expect to use to further reduce the file

Google's Noto Sans CJK JP contains 9 font files, each about 13MB. You can edit fonts to subset glyphs or glyph sets you expect to use to further reduce the file size, although I suspect the CJK languages are never going to be as easy to get to fast web speeds. The JIS X 0208 subset still weighs in at almost 4 MB for a single OTF.