Web modules containing css files are not including the .sass-cache in the marketplace releases.
Download any 1.x version of Liferay Audience Targeting from marketplace, unzip and check the for example the web module:
For the version v1.1.4
Liferay Audience Targeting/com.liferay.content.targeting.web-portlet.jar/css/ct_simulator/
It does not contain the .sass-cache folder:
Liferay Audience Targeting/com.liferay.content.targeting.web-portlet.jar/css/ct_simulator/.sass-cache/
Note for 6.2.10: This means that css files are parsed in runtime affecting a lot to the performance.
After the issue is fixed, the loading time of the CSS resources will be notably reduced. By enabling the ALL log level for the DynamicCSSUtil class, the following lines will be now observed: