nvim-dap

It's a bit silly to claim that any debugger comes with zero performance "overheads". And somehow they failed to think of any drawbacks for the debugger they ship in their paid software... I use nvim-dap with nvim-dap-ruby; it's excellent. Every benefit the post ascribes to RM's debugger applies to nvim-dap (modulo the user's ability to do basic neovim customization), with the added points that: - nvim-dap is protocol-based, so you can use the same configuration with many languages - it's completely free https://github.com/mfussenegger/nvim-dap https://github.com/suketa/nvim-dap-ruby

There are DAP extensions for both Vim (e.g. https://github.com/puremourning/vimspector) and NeoVim (https://github.com/mfussenegger/nvim-dap). I can't speak as to the experience in detail (I think I briefly played with nvim-dap a year or two ago), but I suspect that for most it will be good enough.