Fix slow multiline evaluation due to pexpect sleeps - #160
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I noticed
bash_kernelwas surprisingly slow, and traced it to this. Pexpect by default does a delay of 50ms before evaluating every line, which adds up to 5 seconds in a 100-line cell.It adds a noticeable delay to kernel startup as well, as the
build_cmds()produces about 50 lines to run.