https://tobaek.com/300
English translated version using Google Translate:
https://tobaek-com.translate.goog/300?_x_tr_sl=ko&_x_tr_tl=en&_x_tr_hl=en&_x_tr_pto=wapp
Edit 1:
It seems that at the bottom of the page there are a couple more useful links for dealing with lag.