Message Title

We migrated from Hibernate 4.3.8 to 5.4.14 and migrated from old ehcache 2 to jcache with ehcache 3 based secondary cache. we noticed application being terrible slow. A simple test of bulk reading our entities and iterating over their collections showed following:

with no secondary caching - 10 sec
with old ehcache provider - 13 sec
with new jcache/ehcache 3 - 32 sec
with Apache JCS - 28 sec

Hibernate is 5.4.14, EhCache 3.8.1
my default cache config is consistent for both. in case of jcache it is

<config
    xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance'
    xmlns='http://www.ehcache.org/v3'
    xmlns:jsr107='http://www.ehcache.org/v3/jsr107'
    xsi:schemaLocation="
        http://www.ehcache.org/v3 http://www.ehcache.org/schema/ehcache-core-3.8.xsd
        http://www.ehcache.org/v3/jsr107 http://www.ehcache.org/schema/ehcache-107-ext-3.8.xsd">

  <service>
    <jsr107:defaults default-template="defaultCache" enable-management="false" enable-statistics="false">
    </jsr107:defaults>
  </service>

  <cache-template name="defaultCache">
    <expiry>
      <ttl unit="minutes">60</ttl>
    </expiry>
    <heap unit="entries">20000</heap>
  </cache-template>

  <cache alias="default-update-timestamps-region">
    <expiry>
      <ttl unit="minutes">600</ttl>
    </expiry>
    <heap unit="entries">50000</heap>
  </cache>
</config>