This page outlines current stats for ILS specs related to data import through the user interface.

ILS	Type	single tenant vs multi-tenant	Data import action (imported record type)	Maximum number of records per import job	Duration (during work day) / (off hours)	Notes/additional factors
Alma	cloud	multi-tenant	MARC, match by system ID		30k per hour (work day) / 120k per hour (off hours)	Ex Libris Alma documentation
Sierra	on-prem	single-tenant	MARC authority, create new	1M records (single file)	5-6 hours during the work day	Anecdotal
Sierra	cloud	single-tenant	MARC bibs & items, create new	30K records (single file)	40 minutes	Anecdotal
Sierra	cloud	multi-tenant		10,000 bib records in 10-20 minutes with Scheduler 10,000 bib records in 20-30 minutes with Data Exchange		Above numbers based on medium system load. Sierra can prioritize db writes on a per process basis including setting thresholds. IOW, record load processes can be prioritized against other system processes that write to the db.
Sirsi Unicorn	on-prem	single-tenant	MARC bibs & items, create new, match on 001 (occurred in 2010)	43K+ records (single file)	12 minutes (work day)	View partial log from test load of this file
Polaris	on-prem		Create 50-150 records 10-20 seconds Update 50-150 records 10-20 seconds Create & update 50-200+ 10-30 seconds	1,000	any time of day	Importing large quantities of records may slow response times for other processes in Polaris. Therefore, you may want to start the import process when the library is closed and when it will not interfere with scheduled system backups.” Source: Polaris documentation
Voyager	on-prem		For optimum importing performance, import 10,000 records (or less) at one time. If your record file is larger than 10,000 records, it should be broken into smaller sets of records If you are using *WebAdmin*, which also uses Bulk Import, the same general rules apply, however because you are uploading the file through your browser you should keep the imports in the 1000-5000 records range.			For optimum importing performance, import 10,000 records (or less) at one time. If your record file is larger than 10,000 records, it should be broken into smaller sets of records (using the -b and -e parameters) and then imported one after the other.” Voyager documentation Analysis of Voyager Load Performance, December 2014 Overview of Voyager bulk import process How many records can I import?
Koha
Aleph

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