proxy_temp_path is very slow

[Indo Php]

Hello,

I'm using proxy_cache with nginx. I have nginx set as proxy cache to get the file from servers in onother country.

Sometimes I have almost 3000 files in the temp path, and my disk I/O is very high. Actually I'm using 2 SSD with RAID-0.

May I know is there any other problems? Here's my config
    proxy_cache_path  /var/nginx/folder levels=1 keys_zone=one:1000m inactive=7d max_size=300g;
    proxy_temp_path   /var/nginx/temp;
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