Cache the file contents, perhaps? Isolate actual file I/O to dedicated threads and vend reads and writes from it? Buffer writes in-memory, only flushing at so

Cache the file contents, perhaps? Isolate actual file I/O to dedicated threads and vend reads and writes from it? Buffer writes in-memory, only flushing at some interval or when the buffer fills up? Use a DB server and not raw files? Lots of ways to skin this cat, but it really depends on what the application is doing and why.