Lazy load tabs to speed up the startup time

[fatjing]

The startup performance lacks severely if the program is configured to load the previous session on start, especially when a lot of tabs need to be restored.
It'd be nice to have only the foreground tab restored at startup, and lazy load those background tabs upon switching.

[brzGatsu]

+1 I usually have a dozen pdfs opened that are located on my NAS. Opening Sumatra sometimes takes up to 10 seconds.

[jddcef]

It loads pretty fast for me the last year or so, using the 3.5 etc pre-release versions.

[kjk]

I've implemented loading on background threads, so slow documents no longer block the main thread (i.e. you get fast startup time).

[jddcef]

Just realised, why is it called a "pre-release", if it's actually AFTER the last release.

A pre-release sounds older, as if it's before (pre) the actual release, therefore outdated!

p.s. the website's page is missing links to download on https://www.sumatrapdfreader.org/prerelease

[kjk]

Well, it's before the next release. But I see how this might be confusing.

p.s. the website's page is missing links to download

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[hpvd]

follow up on optimizing startup time incl. approach see #4803