If it wasn't React it would be [insert any other framework here]. React isn't the cause - bad developer practice is. As you said - a text box is laggy due to ho

If it wasn't React it would be [insert any other framework here]. React isn't the cause - bad developer practice is. As you said - a text box is laggy due to how horrific the code base is. That's not something that is going to be fixed by changing library.