Slow performance on strapi

System Information
  • Strapi Version: 3.6.3
  • Operating System: Ubuntu 20.04 LTS
  • Database: Mongo db (in another instance)
  • Node Version: v12.22.10
  • NPM Version: 6.14.16
  • Yarn Version:

Hello, i was working on this proyect for a 6 months aprox. I have a really issue, becouse strapi take 15 second to load admin panel. At the first time, i was thinking it was a CPU/MEM issue and i dont worried about this.

  • I tried with node version 14 too.
  • I installed to cache with redis.
  • I created a lot of index in mongo.
  • I tryed optimize the images,docs in uploads folder.
    But the performance its mostly the same.

Now i have 3 machines (Mongo standalone, frontend , strapi)
For each machine with 4 CPU cores 8 threads, 12 GB de memory, and it go really slow (mostly the same performane of my dev server).
I read a lot of documentantion, and now im lost… dont know what i should do.

Could you give me some ideas to improve the performance, please?
Thank you in advance.