Large collection in VB6

Hi

I have a program that implements the following structure

Each file has a collection of record
Each record has a collection of fields
Each Field has a collection of errors

When I run the program on a file with 20,0000 records of 58 fields (with a trivial number of errors) it takes for ever (5 minutes) to set the record collection to Nothing (explicitly or by using the END statement)

Can anyone suggest how I can overcome this issue?

Thanks