Fixed in git, commit d69cd759, by incrementing a pointer instead of moving the keycodes.  Thanks again for reporting.

Hello,

Since I first started using nano I noticed a distinct delay in pasting longer clipboard buffers.

Lately, however, I incidentally had to do some huge pastes which took forever. Digging into the issue I found out that pasting takes quadratic time. To be exact, when the key_buffer is being consumed, the following code is used in get_input of src/winio.c:


        /* If the buffer contains more codes, move them to the front. */
       if (--key_buffer_len > 0)
               memmove(key_buffer, key_buffer + 1, key_buffer_len * sizeof(int));


This being in an intra-procedural loop means that the memcpy does N + (N-1) + (N-2) + ... + 1 writes. This has been observed when profiling such a scenario. See the attached screenshot.

I have attached my quick fix which I tested in various scenarios in the last few days. Works for me. Pasting 1MB of base64 text without the patch takes 45 seconds whereas after the patch takes 1 second.

Regards,
Radu