Add option to disable automatic conversion
If strings become very long, conversion will become very slow. Users should have the option to disable immediate conversion of inputs using a checkbox at the top of the page.
Alternatively, evaluate the inputs only once per second, so that changing the input while typing doesn't invoke all sorts of calculations right away.
Alternatively alternatively, evaluate right away for small inputs, but once they become larger than X characters, switch to delayed invocation.
Alternatively alternatively alternatively, make the delay between updates linearly dependent on the input size.
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