diff --git a/src/base/bittorrent/session.cpp b/src/base/bittorrent/session.cpp
index 460a87603..dc39a6b73 100644
--- a/src/base/bittorrent/session.cpp
+++ b/src/base/bittorrent/session.cpp
@@ -374,8 +374,8 @@ Session::Session(QObject *parent)
     , m_announceToAllTiers(BITTORRENT_SESSION_KEY("AnnounceToAllTiers"), true)
     , m_asyncIOThreads(BITTORRENT_SESSION_KEY("AsyncIOThreadsCount"), 4)
     , m_filePoolSize(BITTORRENT_SESSION_KEY("FilePoolSize"), 40)
-    , m_checkingMemUsage(BITTORRENT_SESSION_KEY("CheckingMemUsageSize"), 16)
-    , m_diskCacheSize(BITTORRENT_SESSION_KEY("DiskCacheSize"), 64)
+    , m_checkingMemUsage(BITTORRENT_SESSION_KEY("CheckingMemUsageSize"), 32)
+    , m_diskCacheSize(BITTORRENT_SESSION_KEY("DiskCacheSize"), -1)
     , m_diskCacheTTL(BITTORRENT_SESSION_KEY("DiskCacheTTL"), 60)
     , m_useOSCache(BITTORRENT_SESSION_KEY("UseOSCache"), true)
 #ifdef Q_OS_WIN
@@ -432,7 +432,7 @@ Session::Session(QObject *parent)
     , m_isBandwidthSchedulerEnabled(BITTORRENT_SESSION_KEY("BandwidthSchedulerEnabled"), false)
     , m_saveResumeDataInterval(BITTORRENT_SESSION_KEY("SaveResumeDataInterval"), 60)
     , m_port(BITTORRENT_SESSION_KEY("Port"), -1)
-    , m_useRandomPort(BITTORRENT_SESSION_KEY("UseRandomPort"), false)
+    , m_useRandomPort(BITTORRENT_SESSION_KEY("UseRandomPort"), true)
     , m_networkInterface(BITTORRENT_SESSION_KEY("Interface"))
     , m_networkInterfaceName(BITTORRENT_SESSION_KEY("InterfaceName"))
     , m_networkInterfaceAddress(BITTORRENT_SESSION_KEY("InterfaceAddress"))