It turns out this behavior is caused by commit # 5736 <https://github.com/apereo/cas/pull/5736> (master branch commit # 5652 <https://github.com/apereo/cas/pull/5652>). That commit removed the default setting for server.tomcat.background-processor-delay.
server.tomcat.background-processor-delay=0s Adding this setting back fixes the slow rendering issues. Interestingly enough in the original commit to master branch there is a comment from mmoayyed about performance issues but then he and dima767 couldn't find any evidence of it occurring. Unfortunately it seems that maybe that wasn't documented anywhere because this definitely has a significant performance impact both during the first page load and validating authentication using saml (such as providing login for Google). I was experiencing a consistent 8-10 second delay that disappeared completely upon restoring the setting. Again, the other issue of static files not loading also must be addressed by upgrading Tomcat to 9.0.82 to incorporate the fix to HTTP compression. On Saturday, November 4, 2023 at 3:26:03 PM UTC-4 Doug C wrote: > Thanks for the tip! > > I gave it a try but it did not seem to change the behavior of static files > not loading. If it was intended in relation to the sluggish response it > also did not have the desired effect. > > Then I actually discovered that it was already disabled by default. > > So, I will continue to rely on upgrading Tomcat to 9.0.82 to resolve the > failed loading of the static files and keep researching what might be > causing the sluggishness. I continue to appreciate any further tips or > suggestions. > > Thanks! > > On Saturday, November 4, 2023 at 1:25:23 PM UTC-4 Mohamed Amdouni wrote: > > Hello, > > Could be related to http/2 multiplexing features. > > Multiplexing should enhance performance but in some situations it does not > (if the browser is not compatible etc) > > I would try disabling http2 to confirm the root cause by setting. > > server.http2.enabled=false > > > Best regards. > > Le sam. 4 nov. 2023 à 07:45, Doug C <[email protected]> a écrit : > > I also experienced something like this when upgrading from 6.5.8 to > 6.6.13. When running 6.6.13, a number of .js files would not load due to a > *net::ERR_HTTP2_PROTOCOL_ERROR* error. > > After downgrading to 6.6.10, there were no errors. > > I also attempted 6.6.11 and 6.6.12 and while there are no errors, it is > also extremely slow to respond. At least on the first page load for any of > the configured service registries and the processing of their logins. > After that it speeds up but is overall slow compared to 6.6.10. > > I noticed that the version of Tomcat increases with each release so I did > a test of switching the tomcat-*.jar files in 6.6.10 with those distributed > with 6.6.13; this switches from running Tomcat 9.0.78 to 9.0.81. After > doing so when I access the CAS login page, I again am unable to load a > number of .js files due to the same error. > > I then did a similar switch with 6.6.13 to downgrade Tomcat to 9.0.78. > After doing so there was no problem loading the .js files. There was a > slight quirk with what I believe is a custom label in my theme. > > Now, this only seems to maybe address the issue of the .js files not > loading. There also appears to be a much slower initial response to page > loads and a slightly slower continual response to page loads and login > responses. > > I would appreciate any thoughts on how to continue to troubleshooting what > is happening. > > Oh, one final note. I did try out the latest 7.0.0 snapshot and found > that the .js not loading is not a problem there but the slow response is. > > Thanks! > > > On Thursday, November 2, 2023 at 1:40:43 PM UTC-4 [email protected] > wrote: > > Hi, > > I was planning to update our 6.4.2 instances to 6.6.13, when I discovered > something strange : when the login page is called for the first time on a > freshly launched browser (or after total cache cleaning), it takes ages to > be rendered (over 20s). But all subsequent calls are fine as long as the > browser is not restarted. > > This has been experienced with Firefox, Chromium and Edge on both Linux > and Windows. > > Of course, everyting was fine with the current 6.4.2. > > I order to investigate in a neutral context, I gave a try to the stock > "apereo/cas:6.6.13" official Docker image and the problem also occurs. > As it is very easy to try different versions with Docker images, I did the > same with "6.6.12" version : no problem at all, everything is fine from the > beginning. > > I also wanted to build it with my own configuration and additions, but I > am a bit lost with releases, as "6.6.12" and "6.6.13" archives contain > "7.0.0-SNAPSHOT" stuff. The one tagged as > "cas-overlay-template-20231031143146" is also "faulty" and as was not able > to get any "6.6.12" archive or earlier. > > Fortunately, I had downloaded a "6.6.10" release which is working > correctly. In case of severe "updatemania", I can still deploy this one. > > Using the web development tools to debug page rendering shows there is a > huge amount of spent with JS inclusions with the "faulty" versions. > So I think there is something wrong with those JS librairies, as disabling > JS in the browser allows the page to be rendered in a snap. But of course, > it's not a viable option IRL unfortunately :-( > > I can sound vain, but with more than one thousand users almost threatened > with death if they don't switch off their computer every night, I don't > want to expose ourselves to a support tickets storm saying "something is > wrong with x or y application", just because morning login phase has > become excessively slow :-) > > Is there a workaround ? JS is definitely not my cup of tea so I have no > idea how to fix that or what to replace. > > Regards > > > > > > > > > > ------------------------------ > FreeMail powered by mail.fr > > -- > - Website: https://apereo.github.io/cas > - Gitter Chatroom: https://gitter.im/apereo/cas > - List Guidelines: https://goo.gl/1VRrw7 > - Contributions: https://goo.gl/mh7qDG > --- > You received this message because you are subscribed to the Google Groups > "CAS Community" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To view this discussion on the web visit > https://groups.google.com/a/apereo.org/d/msgid/cas-user/e3b20bdc-3920-4f10-8957-40603d34f297n%40apereo.org > > <https://groups.google.com/a/apereo.org/d/msgid/cas-user/e3b20bdc-3920-4f10-8957-40603d34f297n%40apereo.org?utm_medium=email&utm_source=footer> > . > > -- - Website: https://apereo.github.io/cas - Gitter Chatroom: https://gitter.im/apereo/cas - List Guidelines: https://goo.gl/1VRrw7 - Contributions: https://goo.gl/mh7qDG --- You received this message because you are subscribed to the Google Groups "CAS Community" group. 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