diff --git a/src/common/config/config.cpp b/src/common/config/config.cpp
index ecd80b9d14..876b641fef 100644
--- a/src/common/config/config.cpp
+++ b/src/common/config/config.cpp
@@ -83,7 +83,10 @@ const ConfigImpl::ConfigEntry ConfigImpl::entries[] =
 	{TYPE_INTEGER,		"EventMemSize",				(ConfigValue) 65536},		// bytes
 	{TYPE_INTEGER,		"DeadlockTimeout",			(ConfigValue) 10},			// seconds
 	{TYPE_INTEGER,		"SolarisStallValue",		(ConfigValue) 60},			// seconds
-	{TYPE_BOOLEAN,		"TraceMemoryPools",			(ConfigValue) false}		// for internal use only
+	{TYPE_BOOLEAN,		"TraceMemoryPools",			(ConfigValue) false},		// for internal use only
+	{TYPE_INTEGER,		"PrioritySwitchDelay",		(ConfigValue) 100},			// milliseconds
+	{TYPE_INTEGER,		"DeadThreadsCollection",	(ConfigValue) 50},			// number of PrioritySwitchDelay cycles before dead threads collection
+	{TYPE_INTEGER,		"PriorityBoost",			(ConfigValue) 5},			// ratio oh high- to low-priority thread ticks in jrd.cpp
 };
 
 /******************************************************************************
@@ -314,3 +317,29 @@ bool Config::getTraceMemoryPools()
 {
 	return (bool) sysConfig.values[KEY_TRACE_MEMORY_POOLS];
 }
+
+int Config::getPrioritySwitchDelay()
+{
+	int rc = (int) sysConfig.values[KEY_PRIORITY_SWITCH_DELAY];
+	if (rc < 1)
+		rc = 1;
+	return rc;
+}
+
+int Config::getDeadThreadsCollection()
+{
+	int rc = (int) sysConfig.values[KEY_DEAD_THREADS_COLLECTION];
+	if (rc < 1)
+		rc = 1;
+	return rc;
+}
+
+int Config::getPriorityBoost()
+{
+	int rc = (int) sysConfig.values[KEY_PRIORITY_BOOST];
+	if (rc < 1)
+		rc = 1;
+	if (rc > 1000)
+		rc = 1000;
+	return rc;
+}
diff --git a/src/common/config/config.h b/src/common/config/config.h
index 6b647d3ca0..a61eb8c5d7 100644
--- a/src/common/config/config.h
+++ b/src/common/config/config.h
@@ -86,7 +86,10 @@ class Config
 		KEY_EVENT_MEM_SIZE,							// 19
 		KEY_DEADLOCK_TIMEOUT,						// 20
 		KEY_SOLARIS_STALL_VALUE,					// 21
-		KEY_TRACE_MEMORY_POOLS						// 22	
+		KEY_TRACE_MEMORY_POOLS,						// 22	
+		KEY_PRIORITY_SWITCH_DELAY,					// 23
+		KEY_DEAD_THREADS_COLLECTION,				// 24
+		KEY_PRIORITY_BOOST							// 25	
 	};
 
 public:
@@ -205,6 +208,21 @@ public:
 		Trace memory pools
 	*/
 	static bool getTraceMemoryPools();
+
+	/*
+		Priority switch delay
+	*/
+	static int getPrioritySwitchDelay();
+
+	/*
+		Dead threads collection
+	*/
+	static int getDeadThreadsCollection();
+
+	/*
+		Priority boost
+	*/
+	static int getPriorityBoost();
 };
 
 #endif // CONFIG_H
diff --git a/src/jrd/jrd.cpp b/src/jrd/jrd.cpp
index d19d2c33b9..d7d459ac7b 100644
--- a/src/jrd/jrd.cpp
+++ b/src/jrd/jrd.cpp
@@ -769,7 +769,8 @@ STATUS DLL_EXPORT GDS_ATTACH_DATABASE(STATUS*	user_status,
 	dbb->dbb_attachments = attachment;
 	dbb->dbb_flags &= ~DBB_being_opened;
 	dbb->dbb_sys_trans->tra_attachment = attachment;
-	tdbb->tdbb_quantum = (THPS_BOOSTDONE() ? 5 : 1) * QUANTUM;
+	tdbb->tdbb_quantum = (THPS_BOOSTDONE() ? 
+						  Config::getPriorityBoost() : 1) * QUANTUM;
 	tdbb->tdbb_request = NULL;
 	tdbb->tdbb_transaction = NULL;
 	tdbb->tdbb_inhibit = 0;
@@ -4446,7 +4447,9 @@ BOOLEAN JRD_reschedule(TDBB tdbb, SLONG quantum, BOOLEAN punt)
 	}
 
 	tdbb->tdbb_quantum = (tdbb->tdbb_quantum <= 0) ?
-		((quantum) ? quantum : (THPS_BOOSTDONE() ? 5 : 1) * QUANTUM) : tdbb->tdbb_quantum;
+		(quantum ? quantum : (THPS_BOOSTDONE() ? 
+			Config::getPriorityBoost() : 1) * QUANTUM) : 
+		tdbb->tdbb_quantum;
 
 	return FALSE;
 }
diff --git a/src/jrd/os/win32/thd_priority.cpp b/src/jrd/os/win32/thd_priority.cpp
index 83dc770532..5b9200b0a9 100644
--- a/src/jrd/os/win32/thd_priority.cpp
+++ b/src/jrd/os/win32/thd_priority.cpp
@@ -23,12 +23,13 @@
 
 #include "firebird.h"
 #include "../jrd/os/thd_priority.h"
+#include "../common/config/config.h"
 
 #ifdef THREAD_PSCHED
 
 // configurable parameters
-#define THPS_TIME 100			// ms between rescheds
-#define THPS_TICKS 50			// sched loops before thread killing 
+#define THPS_TIME (Config::getPrioritySwitchDelay())	// ms between rescheds
+#define THPS_TICKS (Config::getDeadThreadsCollection())	// sched loops before thread killing
 
 #include "../jrd/ib_stdio.h"
 #include <errno.h>