The only legitimate way to completely remove the speed cap is through a paid membership. Nexus Mods uses a global Content Delivery Network (CDN) and charges are based on connection speeds provided, making caps necessary for their free-to-use business model. Capped at roughly 1.5 MB/s . Free Users (No Ad-Block): Capped at 3 MB/s .
This has led to a massive underground search trend: Nexus Download Speed Bypass