Visualforce Transient keyword Performance Tuning

Use the transient keyword to declare instance variables that can’t be saved, and shouldn’t be transmitted as part of the view state for a Visualforce page. For example:

    Transient Integer calculateTotalOpportunityAmount;

Common use case: use transient keyword for field on a Visualforce page that is needed only for the duration of a page request, but should not be part of the page’s view state and would use too many system resources to be recomputed many times during a request. Example below:

    transient public List connections { get; private set; }
    transient public List previousEmployers { get; private set; }
    transient public Set hashTags { get; private set; }

    private List retrievePreviousEmployers() {
        List a = new List();
        a.add(new Account(Name = 'GE'));
        a.add(new Account(Name = 'Siemens'));
        a.add(new Account(Name = 'EADS'));
        return a;

   private List retrieveConnections() {
        return [
            SELECT Id, Name
            FROM Contact
            OFFSET 1

 private Set retrieveHashTags() {
        Set s = new Set();
        return s;

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