Inline or saved searches don't affect their performance, that's just where the search string is stored.
Some common ways to improve performance of a many-searches dashboard:
- Look for commonality between searches. When found, combine several searches into one and use post-processing to drive several panels off one search.
- Look for searches eligible for report acceleration
- Look for long-running searches left over after these steps and schedule those searches
Above all that there's general search performance optimization, such as reducing the number of events scanned to achieve the search goal or replacing costly operations with cheaper ones or avoiding inefficient wildcard matches.
