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InfluxDB
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SaaSHub
SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives
Might I pitch emacs-groundup :D
Literate config - build an indexed, documented, collapsible, org-mode powered config. Start here using this live-stream tutorial
Maybe you've seen them already but there's also http://emacsrocks.com/ videos, emacsconf too
That is an issue both related to Emacs' internal representation of buffers and modes working in the background on the data in buffers of very large files, for which there are some workarounds like vlf-mode. See for example (info "(emacs) Long Lines") for similar issues with long lines and a solution more similar to what all those other editors you mention are doing to mitigate the issue of large files and large lines.
Regarding JSON, things are starting to improve: https://github.com/iwahbe/jsonian/ is pretty good, better than both javascript-mode and json-mode, even without the speed improvements.