Joomla - JCH_Optimize plug Fix - Template Speed-Up

My website needs speeding up too 4 sec load from 16sec It is being done with JCH_Optimize but css issuie on sobi search output I can get 9sec with safe settings then css combine and below error occur This fix or another fix to make this bulky gantry template load quick, any idea's Warning: filemtime() [[login to view URL]]: stat failed for /home/direct/public_html/cache/plg_JCH_Optimize/[login to view URL] in /home/direct/public_html/plugins/system/JCH_Optimize/[login to view URL] on line 54 Warning: Cannot modify header information - headers already sent by (output started at /home/direct/public_html/plugins/system/JCH_Optimize/[login to view URL]) in /home/direct/public_html/plugins/system/JCH_Optimize/[login to view URL] on line 54 thanks