Avoid importing multiple CSS files individually
Impact area
Performance
Severity
Medium
Affected element
Apex Page
Rule ID
SF-0118
Impact
Importing multiple static resources increases page load time.
Remediation
Combine all CSS files into a single file to reduce the number of HTTP requests.
Time to fix
30 min
References
See the Salesforce documentation article: Visualforce Performance: Best Practices > Optimizing CSS.