Hi there , I’m sorry I don’t speak Japanese but I think this will be relevant for you and your users. I used Google Translate to read this page of yours: xiongcaichang.com/index.php/page/6/ I got your advice on the Gzip tool. The tool you're sharing is nice, but sometimes it doesn't work (maybe too many simultaneous users slow it down?), and it was really annoying. I've googled a bit and started using the tool below and it works perfectly! Plus, I love the simple and clear design. So I thought, why not share it with you, since you got me started with this anyhow.
Here it is: https://www.websiteplanet.com/ja/webtools/gzip-compression/
I'm sure your other users will enjoy as much as I did if you decide to share it with them :)
All the best, Paola.