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EFCore.BulkExtensions
Entity Framework EF Core efcore Bulk Batch Extensions with BulkCopy in .Net for Insert Update Delete Read (CRUD), Truncate and SaveChanges operations on SQL Server, PostgreSQL, MySQL, SQLite
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
2nd option as you're basically doing batch save changes where batch size is 100. You should put a transaction on top of all of this though and commit at the end for data integrity reasons but that's about it. Alternatively use a NuGet that can do batch save changes (Z.EntotyFramework is paid, but https://github.com/borisdj/EFCore.BulkExtensions is free).
EF Core and fast insert are two different things. Better to use appropriate extensions for that, Actually I'm the one who enabled linq2db for EF Core via linq2db.EntityFrameworkCore