[strongSwan] strongswan network speed is slow

[Kula]

I set up a strongswan server with v5.9.6

when i download a page on the vpn server.

root at localhost:~# wget
https://assets.nflxext.com/web/ffe/wp/akira/akiraClient.js.aebe7f9798c815f1c43a.js
--2022-07-30 05:07:42--
https://assets.nflxext.com/web/ffe/wp/akira/akiraClient.js.aebe7f9798c815f1c43a.js
Resolving assets.nflxext.com (assets.nflxext.com)...
2a00:86c0:2090::1, 2a00:86c0:2091::1, 45.57.90.1, ...
Connecting to assets.nflxext.com
(assets.nflxext.com)|2a00:86c0:2090::1|:443... connected.
HTTP request sent, awaiting response... 200 OK
Length: unspecified [application/javascript]
Saving to: ‘akiraClient.js.aebe7f9798c815f1c43a.js’

akiraClient.js.aebe     [ <=>                ]   4.40M  --.-KB/s    in 0.06s

2022-07-30 05:07:42 (69.1 MB/s) -
‘akiraClient.js.aebe7f9798c815f1c43a.js’ saved [4612511]

it only cost 0.06s.

but when i download the page on the vpn client.

➜  ~ wget https://assets.nflxext.com/web/ffe/wp/akira/akiraClient.js.aebe7f9798c815f1c43a.js
--2022-07-30 13:05:13--
https://assets.nflxext.com/web/ffe/wp/akira/akiraClient.js.aebe7f9798c815f1c43a.js
正在解析主机 assets.nflxext.com (assets.nflxext.com)... 45.57.91.1,
45.57.90.1, 2a00:86c0:2090::1, ...
正在连接 assets.nflxext.com (assets.nflxext.com)|45.57.91.1|:443... 已连接。
已发出 HTTP 请求，正在等待回应... 200 OK
长度： 未指定 [application/javascript]
正在保存至: ‘akiraClient.js.aebe7f9798c815f1c43a.js’

akiraClient.js.aebe     [              <=>   ]   4.40M   131KB/s    用时 1m 46s

2022-07-30 13:07:07 (42.4 KB/s) -
‘akiraClient.js.aebe7f9798c815f1c43a.js’ 已保存 [4612511]

it cost 1m 46s.

Is there anything I should look up to get more information ? and How can I
optimize it?
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