カスタムプラグインによるディスコースの過負荷。助けてください

[merefield (Robert)]

まだ使用していない場合は、CDNを追加することもできます。

Should I add CDN despite my server is close to my users?

Only way to find out is test Not expecting any major advantages, but a CDN will reduce some of the load on your application server. Also you may have multiple POPs in South Korea so you would possibly serve the files closer to the end users if you pick the right CDN.