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parse_sssom_table() performance: can be very slow #585

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@joeflack4

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I was using this to read a TSV, and it took several minutes to complete. If I read with pandas, it is basically instant.

Could be related to #513 (sub-issue 2). The bottleneck in that sub-issue is that when a new MappingSetDataFrame is constructed without passing a converter, it is very slow. That could be what's going on under the hood with parse_sssom_table().

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