Hello. I use "RainLab Blog" + "Blog Taxonomy" plugins. At the start of the project, everything worked quickly. But now I have more than 8000 blog entries and the server response is 8 seconds! Can you tell me how I can speed up the server response? I use pagination. I upload only 30 posts per page

This could be a limitation of the Blog Taxonomy plugin. These datasets usually do suffer from performance problems at high record counts. It would require some investigation from the plugin author. Try contacting the author for assistance on improving the query performance