Hi. While searching for some existing jmh tests I found https://issues.apache.org/jira/browse/CXF-6189 Improve memory usage of UrlUtils. Sergey says there "I recall awhile back I saw RestEasy and Oltu using the same code for encoding/decoding". Discussion on CXF-6189 is quite interesting, fixed class in CXF is https://github.com/apache/cxf/blob/master/core/src/main/java/org/apache/c... Sergey's comment made me wondering which util class he is referring to. Naive approach with https://github.com/resteasy/Resteasy/blob/master/resteasy-jaxrs/src/main/... seems to be incorrect. My bet would be on https://github.com/resteasy/Resteasy/blob/master/resteasy-jaxrs/src/main/... All possibilities: grep -l URLDecoder . -R | grep "src/main/java" | sort ./providers/multipart/src/main/java/org/jboss/resteasy/plugins/providers/multipart/ContentIDUtils.java ./providers/multipart/src/main/java/org/jboss/resteasy/plugins/providers/multipart/i18n/Messages.java ./resteasy-jaxrs/src/main/java/org/jboss/resteasy/core/AcceptParameterHttpPreprocessor.java ./resteasy-jaxrs/src/main/java/org/jboss/resteasy/core/QueryParamInjector.java ./resteasy-jaxrs/src/main/java/org/jboss/resteasy/spi/ResteasyUriInfo.java ./resteasy-jaxrs/src/main/java/org/jboss/resteasy/util/Encode.java ./security/resteasy-oauth/src/main/java/org/jboss/resteasy/auth/oauth/OAuthServlet.java ./tjws/src/main/java/Acme/Utils.java I think memory footprint changes done as part of https://issues.apache.org/jira/browse/CXF-6189 could be hopefully used as an inspiration for changes in RESTEasy. I miss expertise with the codebase whether CXF-6189 changes are relevant for us and where it could be applied. Basically searching for volunteer before I force push myself to forget about it. Thanks. Rostislav