Queries like the one below will perform more slowly than they could be run on a varchar column.
Explicitly marking them as such will improve the performance of EF queries as it would query with the right type.
dataContext.Tables.Where(k = k.MyStringProperty == someValue);
Explicit type specification on the property though the Column attribute.
[Column(TypeName="varchar")]
public string MyStringProperty { get; set; }
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