And why the forum page is not excluded from your forum plugin?
Please read this FAQ topic and exclude it: https://wpforo.com/community/faq/wpforo-and-cache-plugins/
https://gtmetrix.com/reports/www.staging9.manojk365.com/WSFByTu4
using this tool, please see the header, due to this, I am getting too much waiting time. In staging site, many add-ins are disabled.
This is not a real-time tool. It caches the result. So don't use it.
1. Exclude form page from the cache plugin: https://wpforo.com/community/faq/wpforo-and-cache-plugins/
2. if you have wpForo addons, please deactivate them.
3. Delete all caches and purge CDN / CSS /JS minifications
4. Delete all cookies again, close / open browser and check it again.
If the issue is not fixed, try to deactivate wpForo temporarily, the issue maybe caused by other plugins too.
I have already checked to deactivate other plugins, this issue resolved using this tool also after disabled fopro. already excluded pages from SG optimizer.
thanks