Optimize DDS linq query.

HI,

I need suggestions to optimize below linq query.

store.Items<StorageMessage>().ToList()
.Where(x => x.Recipients.Select(y => y.Code).Contains(testCode))
.OrderByDescending(x => x.DateCreated)
.ToList();

the use of ToList() is affecting performance and sometimes results in timeout error.

we tried to apply where condition on store directly but getting different results.

Any Suggestions?