diff --git a/application/src/main/resources/thingsboard.yml b/application/src/main/resources/thingsboard.yml
index 1a932160ad..b0b822b90e 100644
--- a/application/src/main/resources/thingsboard.yml
+++ b/application/src/main/resources/thingsboard.yml
@@ -583,6 +583,9 @@ queue:
     linger.ms: "${TB_KAFKA_LINGER_MS:1}"
     buffer.memory: "${TB_BUFFER_MEMORY:33554432}"
     replication_factor: "${TB_QUEUE_KAFKA_REPLICATION_FACTOR:1}"
+    max_poll_records: "${TB_QUEUE_KAFKA_MAX_POLL_RECORDS:8192}"
+    max_partition_fetch_bytes: "${TB_QUEUE_KAFKA_MAX_PARTITION_FETCH_BYTES:16777216}"
+    fetch_max_bytes: "${TB_QUEUE_KAFKA_FETCH_MAX_BYTES:134217728}"
     topic-properties:
       rule-engine: "${TB_QUEUE_KAFKA_RE_TOPIC_PROPERTIES:retention.ms:604800000;segment.bytes:26214400;retention.bytes:1048576000}"
       core: "${TB_QUEUE_KAFKA_CORE_TOPIC_PROPERTIES:retention.ms:604800000;segment.bytes:26214400;retention.bytes:1048576000}"
diff --git a/common/queue/src/main/java/org/thingsboard/server/queue/kafka/TbKafkaConsumerTemplate.java b/common/queue/src/main/java/org/thingsboard/server/queue/kafka/TbKafkaConsumerTemplate.java
index 1b5619fd26..de94db804d 100644
--- a/common/queue/src/main/java/org/thingsboard/server/queue/kafka/TbKafkaConsumerTemplate.java
+++ b/common/queue/src/main/java/org/thingsboard/server/queue/kafka/TbKafkaConsumerTemplate.java
@@ -54,6 +54,9 @@ public class TbKafkaConsumerTemplate<T extends TbQueueMsg> extends AbstractTbQue
         if (groupId != null) {
             props.put(ConsumerConfig.GROUP_ID_CONFIG, groupId);
         }
+        props.put(ConsumerConfig.MAX_POLL_RECORDS_CONFIG, settings.getMaxPollRecords());
+        props.put(ConsumerConfig.MAX_PARTITION_FETCH_BYTES_CONFIG, settings.getMaxPartitionFetchBytes());
+        props.put(ConsumerConfig.FETCH_MAX_BYTES_CONFIG, settings.getFetchMaxBytes());
         props.put(ConsumerConfig.ENABLE_AUTO_COMMIT_CONFIG, autoCommit);
         props.put(ConsumerConfig.AUTO_COMMIT_INTERVAL_MS_CONFIG, autoCommitIntervalMs);
         props.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG, "org.apache.kafka.common.serialization.StringDeserializer");
diff --git a/common/queue/src/main/java/org/thingsboard/server/queue/kafka/TbKafkaSettings.java b/common/queue/src/main/java/org/thingsboard/server/queue/kafka/TbKafkaSettings.java
index 66121cb215..659dd19bda 100644
--- a/common/queue/src/main/java/org/thingsboard/server/queue/kafka/TbKafkaSettings.java
+++ b/common/queue/src/main/java/org/thingsboard/server/queue/kafka/TbKafkaSettings.java
@@ -55,6 +55,18 @@ public class TbKafkaSettings {
     @Getter
     private short replicationFactor;
 
+    @Value("${queue.kafka.max_poll_records:8192}")
+    @Getter
+    private int maxPollRecords;
+
+    @Value("${queue.kafka.max_partition_fetch_bytes:16777216}")
+    @Getter
+    private int maxPartitionFetchBytes;
+
+    @Value("${queue.kafka.fetch_max_bytes:134217728}")
+    @Getter
+    private  int fetchMaxBytes;
+
     @Value("${kafka.other:#{null}}")
     private List<TbKafkaProperty> other;
 
diff --git a/rule-engine/rule-engine-components/src/main/java/org/thingsboard/rule/engine/mqtt/credentials/CertPemClientCredentials.java b/rule-engine/rule-engine-components/src/main/java/org/thingsboard/rule/engine/mqtt/credentials/CertPemClientCredentials.java
index 7c140176b7..60895fa002 100644
--- a/rule-engine/rule-engine-components/src/main/java/org/thingsboard/rule/engine/mqtt/credentials/CertPemClientCredentials.java
+++ b/rule-engine/rule-engine-components/src/main/java/org/thingsboard/rule/engine/mqtt/credentials/CertPemClientCredentials.java
@@ -21,7 +21,6 @@ import io.netty.handler.ssl.SslContext;
 import io.netty.handler.ssl.SslContextBuilder;
 import lombok.Data;
 import lombok.extern.slf4j.Slf4j;
-import org.thingsboard.mqtt.MqttClientConfig;
 import org.apache.commons.codec.binary.Base64;
 import org.bouncycastle.jce.provider.BouncyCastleProvider;
 import org.bouncycastle.openssl.PEMDecryptorProvider;
@@ -30,15 +29,26 @@ import org.bouncycastle.openssl.PEMKeyPair;
 import org.bouncycastle.openssl.jcajce.JcaPEMKeyConverter;
 import org.bouncycastle.openssl.jcajce.JcePEMDecryptorProviderBuilder;
 import org.springframework.util.StringUtils;
+import org.thingsboard.mqtt.MqttClientConfig;
 
+import javax.crypto.Cipher;
+import javax.crypto.EncryptedPrivateKeyInfo;
+import javax.crypto.SecretKeyFactory;
+import javax.crypto.spec.PBEKeySpec;
 import javax.net.ssl.KeyManagerFactory;
 import javax.net.ssl.TrustManagerFactory;
 import java.io.ByteArrayInputStream;
-import java.security.*;
+import java.security.AlgorithmParameters;
+import java.security.Key;
+import java.security.KeyFactory;
+import java.security.KeyPair;
+import java.security.KeyStore;
+import java.security.PrivateKey;
+import java.security.Security;
 import java.security.cert.Certificate;
 import java.security.cert.CertificateFactory;
 import java.security.cert.X509Certificate;
-import java.security.interfaces.RSAPrivateKey;
+import java.security.spec.KeySpec;
 import java.security.spec.PKCS8EncodedKeySpec;
 import java.util.Optional;
 
@@ -138,16 +148,36 @@ public class CertPemClientCredentials implements MqttClientCredentials {
     }
 
     private PrivateKey readPrivateKeyFile(String fileContent) throws Exception {
-        RSAPrivateKey privateKey = null;
+        PrivateKey privateKey = null;
         if (fileContent != null && !fileContent.isEmpty()) {
             fileContent = fileContent.replaceAll(".*BEGIN.*PRIVATE KEY.*", "")
                     .replaceAll(".*END.*PRIVATE KEY.*", "")
                     .replaceAll("\\s", "");
             byte[] decoded = Base64.decodeBase64(fileContent);
             KeyFactory keyFactory = KeyFactory.getInstance("RSA");
-            privateKey = (RSAPrivateKey) keyFactory.generatePrivate(new PKCS8EncodedKeySpec(decoded));
+            KeySpec keySpec = getKeySpec(decoded);
+            privateKey = keyFactory.generatePrivate(keySpec);
         }
         return privateKey;
     }
 
+    private KeySpec getKeySpec(byte[] encodedKey) throws Exception {
+        KeySpec keySpec;
+        if (password == null) {
+            keySpec = new PKCS8EncodedKeySpec(encodedKey);
+        } else {
+            PBEKeySpec pbeKeySpec = new PBEKeySpec(password.toCharArray());
+
+            EncryptedPrivateKeyInfo privateKeyInfo = new EncryptedPrivateKeyInfo(encodedKey);
+            String algorithmName = privateKeyInfo.getAlgName();
+            Cipher cipher = Cipher.getInstance(algorithmName);
+            SecretKeyFactory secretKeyFactory = SecretKeyFactory.getInstance(algorithmName);
+
+            Key pbeKey = secretKeyFactory.generateSecret(pbeKeySpec);
+            AlgorithmParameters algParams = privateKeyInfo.getAlgParameters();
+            cipher.init(Cipher.DECRYPT_MODE, pbeKey, algParams);
+            keySpec = privateKeyInfo.getKeySpec(cipher);
+        }
+        return keySpec;
+    }
 }