Apache Ignite is slow with Hibernate L2 Replicated Cache

I'm trying to set up Apache Ignite 2.13 for Hibernate L2 Cache in a Spring Application.

I have it working but compared to Ehcache is really slow (x2 latency). As far as I understand, the replicated cache mode in Ignite works in the same JVM as the application so no network latency is implied.

I also know that performance testing should be done in a distributed environment for Ignite, but even with many instances deployed in Kubernetes, latency is high.

Am I missing something?

I let attached logs from Statistics and my ignite.xml configuration

2022-09-23 13:24:25.268  INFO [xxxx] 1 --- [io-9000-exec-10] i.StatisticalLoggingSessionEventListener : Session Metrics {
    513900 nanoseconds spent acquiring 1 JDBC connections;
    0 nanoseconds spent releasing 0 JDBC connections;
    278500 nanoseconds spent preparing 1 JDBC statements;
    1175200 nanoseconds spent executing 1 JDBC statements;
    0 nanoseconds spent executing 0 JDBC batches;
    0 nanoseconds spent performing 0 L2C puts;
    80603200 nanoseconds spent performing 490 L2C hits;
    0 nanoseconds spent performing 0 L2C misses;
    3686600 nanoseconds spent executing 1 flushes (flushing a total of 306 entities and 573 collections);
    328100 nanoseconds spent executing 1 partial-flushes (flushing a total of 1 entities and 1 collections)
}

<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:util="http://www.springframework.org/schema/util"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
    http://www.springframework.org/schema/beans/spring-beans-3.1.xsd http://www.springframework.org/schema/util https://www.springframework.org/schema/util/spring-util.xsd">

    <bean id="hibernateCache" class="org.apache.ignite.configuration.CacheConfiguration" abstract="true">
        <property name="cacheMode" value="REPLICATED"/>
        <property name="atomicityMode" value="ATOMIC"/>
        <property name="writeSynchronizationMode" value="FULL_ASYNC"/>
        <property name="onheapCacheEnabled" value="true"/>

        <property name="evictionPolicyFactory">
            <bean class="org.apache.ignite.cache.eviction.lru.LruEvictionPolicyFactory">
                <!-- 1 GB-->
                <property name="maxSize" value="900000000"/>
                <property name="maxMemorySize" value="1000000000"/>
            </bean>
        </property>
        <property name="expiryPolicyFactory">
            <bean class="javax.cache.expiry.CreatedExpiryPolicy" factory-method="factoryOf">
                <constructor-arg>
                    <bean class="javax.cache.expiry.Duration">
                        <constructor-arg value="MINUTES"/>
                        <constructor-arg value="10"/>
                    </bean>
                </constructor-arg>
            </bean>
        </property>
    </bean>

    <bean id="ignite.cfg" class="org.apache.ignite.configuration.IgniteConfiguration">
        <property name="clientMode" value="false"/>
        <property name="igniteInstanceName" value="hibernate-grid"/>
        <property name="metricsLogFrequency" value="0"/>
        <property name="discoverySpi">
            <bean class="org.apache.ignite.spi.discovery.tcp.TcpDiscoverySpi">
                <property name="ipFinder">
                    <bean class="org.apache.ignite.spi.discovery.tcp.ipfinder.kubernetes.TcpDiscoveryKubernetesIpFinder">
                    </bean>
                </property>
            </bean>
        </property>
        <property name="cacheConfiguration">
            <list>
                <bean parent="hibernateCache">
                    <property name="name" value="com.example.model0"/>
                </bean>
                <bean parent="hibernateCache">
                    <property name="name" value="com.example.model1"/>
                </bean>
                <bean parent="hibernateCache">
                    <property name="name" value="com.example.modelN"/>
                </bean>
                <bean parent="hibernateCache">
                    <property name="name" value="default-update-timestamps-region"/>
                </bean>
                <bean parent="hibernateCache">
                    <property name="name" value="default-query-results-region"/>
                </bean>
            </list>
        </property>
    </bean>
</beans>