Lightning Performance best practices

Run the “Salesforce Performance Test” to obtain a user(s) Octane score, latency, and download speed

https://[instance].salesforce.com/speedtest.jsp.

Lightning Console Technical Requirements-
https://help.salesforce.com/articleView?id=console2_technical_requirements.htm

In Lightning Experience, page load times can be captured using Lightning Component Debug Mode, or by appending ?eptVisible=1 to your URL.

https://yourDomain.lightning.force.com/one/one.app?eptVisible=1

LWC best practices -

https://developer.salesforce.com/blogs/2020/06/lightning-web-components-performance-best-practices.html

Salesforce Automation Best Practices

Not sure when to use Process Builder/Flows/Workflow/Code, here are the key differences and fitments suggestions -

https://salesforce-automation.herokuapp.com/