This support ticket is created 4 years, 6 months ago. There's a good chance that you are reading advice that it now obsolete.
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Unfortunately there isn't much we can do about this as the speed of the data load is dependent on many things. One of which is wordpress core's ability and your server's ability to deliver the information.
The Ted website seems to be something that is custom built and not using any framework which would allow the developers to optimise their queries specifically for the Ted website.
Unfortunately in this case this is not something that can be done. We have to rely on our team to constantly improve this as we are currently doing.
Right now your site is loading the query within the acceptable parameters so there isn't much that we can do about this.
You can try using the WP Super Cache plugin to help the plugin not to query the database as much but I cannot guarantee any significant performance gains.
a programming issue with toolset cannot cater right now?
Because we plan to make 1000 of videos filtered.
Right now the filtration for just 12 videos is about 4 second.
If 1000 of videos... it's might take more than a minute...for each video filteration.
