The initialization time for new collections varies with the size of the .csv file being loaded (about 1.3 minutes per 1,000 lines). The main factor in increased initialization time is the addition of VRS identifiers to the collection. LocalVar was developed to use local memory rather than a database to store the variant data. Along with making the collection easily downloadable, this design decision also made it much simpler to track the collection edit history and simpler for users to add functionality to the tool. However, it does require more memory (250MB for a benchmark file of 10 columns and 1,000 lines; 600MB for a benchmark file of 10 columns and 10,000 lines).