5 EF Core Performance Anti-Patterns That Entity Framework Extensions Eliminates - Chris Woody Woodruff
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Five common EF Core performance anti-patterns are examined with code examples, explanations of why they fail at scale, and solutions. The patterns covered are: looping inserts (SaveChanges per row), hand-rolled upserts using FirstOrDefault, load-then-delete with ToList, large-list Contains queries hitting SQL Server's 2,100-parameter limit, and multi-pass table synchronization. EF Core 10 natively solves two of them via AddRange+SaveChanges and ExecuteDelete. The other three — upserts, bulk lookups by large ID lists, and full-table sync — have no clean native answer and are addressed by the commercial Entity Framework Extensions library (BulkMerge, WhereBulkContains, BulkSynchronize). Benchmark data is included for each pattern, along with production gotchas like change tracker staleness, interceptors not firing on bulk operations, and transaction management.
