Hi @Luiz_FernandoOrtega
Sorry to hear that performance has dropped in recent weeks. Since you noted that it was fine and now it isn't, we might assume that something changed during that time - which is what Dan's questions are getting at. If you're working with the same projects, same data, stored in the same place, doing the same types of analysis/operations, then we might assume that something about your hardware or perhaps network (if that is how data is being accessed), or antivirus scanning has changed.
Here is a list that you could start working through:
Check the ArcGIS Pro System requirements and be sure to run "Can you run it" to ensure your machine meets or exceeds the minimum requirements.
Update GPU driver Since ArcGIS Pro uses your GPU to accelerate rendering, the first thing a user with ArcGIS Pro should do is update their GPU driver directly from the manufacturer (e.g. NVidia or AMD). New driver releases not only fix bugs and increase stability, but also can give performance increases as well! Note that “manufacturer” means the GPU vendor in the case of a desktop computer, but if you’re using a laptop computer, then you’ll need to get your driver updates from the manufacturer of the laptop itself.
*Note that if you have an AMD graphics card, follow the steps in this article How to Configure Laptop Switchable Graphics
If using a docking station to dock a laptop to external peripherals such as monitors, make sure that the dock’s drivers are up to date as well.
Laptop-specific power settings - If working on a laptop that is plugged in, changing the power options to High Performance can help to ensure that the GPU runs optimally.
There are also display settings that you can adjust to see if performance increases (but again, thinking about the comparison to when everything was performing for you, some of these settings may not need to be changed. As Dan pointed out, clearing the cache might help...)
Set display options
1. Navigate to Projects > Options > Display.
2. On the Display tab:
If you are still in need of troubleshooting assistance after following the above, it will likely require assistance from technical support.
Please let us know the results of working through the steps above.