Thank you for writing. This is a really good article.
Yes, you're right! Plain text IO can be slow and impacted by factors like disk speed, available memory, and CPU utilization. The system can crash if it's under heavy load or doesn't have enough resources to handle IO operations.
To solve performance problems, we do trivial things like buffering, caching, and optimising algorithms and data structures to minimize read and write times and resources. Lastly, we optimized our system configuration, such as adding more memory or upgrading to faster storage devices, to improve IO performance.