After installation of AEM 6.5 SP4, ContextHub started to respond three times slower

[mkolmhuber]

After I installed the SP4 update on a fresh 6.5 publish instance, I realized that the ContextHub performance decreased significantly. A We.Retail page load now takes up to 8 seconds instead of the usual 3 seconds (browser cache disabled). The root cause seems to be that the ContextHub client libraries are pumped three times in a row through the Google Closure Compiler instead of only once. Is there any remedy?

[vanegi · Accepted solution]

There are some known issues related to performance factor of context hub which are reported to engineering via GRANITE-20288 [ContextHub's {kernel,ui}.js should be pre-compiled and cached], etc. This is already fixed in internal 6.6 L16 and will be released via SP.