I didn't see the correct answer yet, so I'll just tell you, tabs have a delay to create because in almost all modern browsers you have to wait for a process to be created and for everything to be paged in, _then_ wait for a bunch of IPC calls to complete.
Old browsers didn't do this, so creating tabs was so fast! But they were also much easier to compromise. Tradeoffs.
Old browsers didn't do this, so creating tabs was so fast! But they were also much easier to compromise. Tradeoffs.
Source: Electron maintainer