my directory indexing speed is acting like it's running on a potato, any tips?

hey folks,

• just launched new user-generated content features for our SaaS, which means a *lot* of new files landing in directories. it's awesome for users, but a bit of a nightmare for our backend.
• problem: my directory indexing speed is just... not keeping up. files take ages to show up in our internal tools, and sometimes even user-facing stuff feels sluggish. it's like the server's having a coffee break and refusing to clock back in.
• what i've done: checked basic disk I/O, made sure there's enough RAM, and even looked at inode usage, but it feels deeper than that. i'm scratching my head.
• main question: looking for real-world strategies or tools to seriously improve directory indexing speed and overall directory perfomance for huge, dynamic content libraries. i'm talking about advanced file system optimization techniques or battle-tested solutions beyond the obvious stuff. any specific configurations or third-party tools you've had success with?

thanks in advance!