Looking through the forum I see that speeding up Logos is not only a concern of mine, but also of many others.
The principal changes I have made are:
1. Increase RAM from 6 to the maximum 8.
2. Clean the laptop regularly with Ccleaner.
3. Use internet 'No'.
Would you agree that this is basically the full list of useful changes?
Thanks for all who have helped me consider this issue.