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Asked: 2026-05-12T11:16:44+00:00

I am currently using a Hashtable to store a list of unique identifiers and

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I am currently using a Hashtable to store a list of unique identifiers and associated data, all of which is read in from a file.

The length of this data file can very greatly, from 1 entry to several hundred thousand. I’ve noticed a significant slowdown in the speed of adding entries to the Hashtable once it gets past about 50,000 entries.

I think setting the initial capacity might help, but obviously I can’t know this number since the data is read from a file. Can anyone suggest a way to speed up adding a lot of entries, or is this behavior pretty normal?

edit: Right now I am just using a Hashtable. I think it should probably be Dictionary<string, MyDataObject>, but that seems like a separate issue.

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1 Answer

  1. Editorial Team

    See here for comparison of HashTables and dictionaries for large numbers of items.

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