Get the speed report of your website (like the screen shot below) and suggestions on how to improve the speed of your website with GTmetrix. GTmetrix report can give you the full picture on how your website loads and it can help detect where bottlenecks are.
Some more ideas for optimizing your websites (mostly for your CMS websites like wordpress);
1). Disable plugins that consumes lots of server resources. According to https://onlinemediamasters.com/slow-wordpress-plugins, below are some plugins that may use up lots of server resources especially CPU;
AdSense Click Fraud Monitoring
Better WordPress Google XML Sitemaps
Broken link checker
Constant Contact for WordPress
Contact Form 7
Contextual Related Posts
Digi Auto Links
Disqus Comment System
Divi builder
Essential Grid
Fuzzy SEO Booster
Google XML Sitemaps
Jetpack
NextGEN Gallery
NewStatPress
Reveal IDs
Revolution Slider
S2 member
SEO Auto Links & Related Posts
Similar Posts
Slimstat Analytics
SumoMe
VaultPress
Visual Composer
WooCommerce
WordPress Facebook
WordPress Related Posts
WordPress Popular Posts
WP Statistics
WP-PostViews
WP Power Stats
wpCloaker
WPML
Yet Another Related Post Plugin
Yuzo Related Posts
2). Ensure your CMS such as WordPress, all plugins and themes are updated to the latest version. NB: Please ensure you backup website files and database before commencing with this.
3). Prevent Spambot (Non-human visitors/spammers) with use of CAPTCHA on all forms on your website including the comment form.
4). For mostly wordpress websites, use page caching to generate static HTML versions of your content. This can simply be achieved by installing plugins such as WP Super Cache (recommended) or W3 Total Cache.
Please submit a support ticket if incase you need further help on improving the speed of your website mostly wordpress website(s)/CMS.
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