help ,this plugin make Apache2 eating 100% CPU

help ,this plugin make Apache2 eating 100% CPU
how should I fit it

PS. it happened when I sunddenly have 5000 visitors

my website (on linode JP VPS)
Intel(R) Xeon(R) CPU E5-2680 v2 @ 2.80GHz
Apache/2.4.6 (Ubuntu) mod_fcgid/2.3.9 PHP/5.5.3-1ubuntu2.6 OpenSSL/1.0.1e

https://ww.wp.xz.cn/plugins/quick-pagepost-redirect-plugin/