Salesforce List Views can become slow to load when they retrieve large numbers of records, use complex filter logic, display many formula or lookup fields, or when users have many permission sets assigned. This article provides best practices to improve List View performance for both end users and Salesforce administrators.
<apex:enhancedList> component that takes a long time to load, a developer can optimize performance by setting the listId attribute to a specific, highly selective List View ID — for example, a view filtered to records created TODAY. This prevents the component from loading all records by default.listId attribute should reference a pre-filtered List View ID that returns a small, targeted set of records. The List View ID can be obtained from the URL of the List View in Salesforce Setup.000383143

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