Urgent: Best site audit crawler?

My current crawling tool is absolutely killing me right now. It keeps crashing on a huge client site, and I've wasted hours trying to get a full crawl done.

While your current tool might feel like it's 'killing' you – hopefully not literally! – the good news is there are highly robust options for comprehensive technical SEO audits on even the largest sites. For desktop-based crawling, the industry standard is still Screaming Frog SEO Spider. It's incredibly powerful, highly configurable, and with appropriate memory allocation (which you can adjust in its settings), it can handle millions of URLs. For sites of significant scale, you'll want to ensure you're running it on a machine with ample RAM and an SSD. Another excellent option, particularly for its visualization and prioritization of issues, is Sitebulb. Both provide deep insights into technical SEO architecture, broken links, redirect chains, duplicate content, and other critical issues impacting crawl budget optimization. For enterprise-level needs or continuous monitoring of truly massive sites (tens of millions of URLs), solutions like Lumar (formerly DeepCrawl) are also worth evaluating, though they operate on a different scale and pricing model. Hope this helps your conversions!