Synapse really really fast. Search instantly without any delay. The quality of the search I really liked.
The program Synapse is a search string that can be called at any time by pressing Ctrl+Spacebar. In the search box you can enter a name or partial name of programs, files, different teams. Keys Left, Right, you can select a category search. If you press Down, you will open a list with additional search results. Full list of hot keys can be found in the program settings.
sudo apt install synapse
sudo add-apt-repository ppa:synapse-core/ppa sudo apt-get update sudo apt-get install synapse