TurboTax Online is equipped to handle around 10,000 individual transactions (give or take) per brokerage account before the performance starts to deteriorate. You may want to explore a summary statement instead of individual transactions.
See this TurboTax Help for more information.
My understanding is that the sample .csv crypto file should be sorted in this order.
Sample CSV crypto.csv
Purchase Date,Date Sold,Proceeds,Cost Basis,Currency Name
2/20/2020,3/15/2021,$485.00 ,$500.00 ,LTC
2/15/2020,4/10/2021,$85.00 ,$80.00 ,BC
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