Hi Maria Alc
Please provide more detail of your system, server, SO; Dédalo version, PHP version, PostgreSQL version, Apache version, RAM and disk space ...
And some questions that can help:
Which Dédalo version do you have?
Your server has enough free RAM? HD?
Do you try to reboot services as PHP, PostgreSQL, Apache,...?
The speed down in all cases or doing something specific?
Best.