I have just setup Odoo as per a tutorial (https://www.getopenerp.com/install-odoo-12-on-ubuntu-18-04/)

Everything went much better than expected. However when logging in via any browser the performance is incredibly slow. You click and wait about 30 seconds for a new window to open when creating a new contact in sales etc. I can't see any issues in the install. The server a way above required spec and internet access is very fast to the server. Has anyone experiences this ?