I just purchased this program and since yesterday, I have been verifying over 37,000 emails at 10 threads, the default. At start, the program was verifying at a decent rate. However, it has almost been 24 hours and the verifier still is verifying emails. It still has over 10,000 left to verify. The vast majority of emails are valid with very few invalid emails. This morning, the program is verifying at a snails pace. It is using 100% of my computer's cpu's. Intermittently, I notice the program's interface grays out. I would appreciate it if someone would advise me on how to fix these issues before I begin shopping around for a more effective and reliable verifier. Thank you.