diff --git a/core/icmp.go b/core/icmp.go
index 8f4154a..554854e 100644
--- a/core/icmp.go
+++ b/core/icmp.go
@@ -473,8 +473,12 @@ func icmpalive(host string) bool {
 // RunPing 使用系统Ping命令并发探测主机存活
 func RunPing(hostslist []string, chanHosts chan string, livewg *sync.WaitGroup) {
 	var wg sync.WaitGroup
-	// 限制并发数为50
-	limiter := make(chan struct{}, 50)
+	// 并发数根据主机数动态调整，上限 200
+	concurrency := len(hostslist)
+	if concurrency > 200 {
+		concurrency = 200
+	}
+	limiter := make(chan struct{}, concurrency)
 
 	// 并发探测
 	for _, host := range hostslist {
@@ -677,20 +681,34 @@ func ArrayCountValueTop(arrInit []string, length int, flag bool) (arrTop []strin
 var tcpProbeCommonPorts = []int{80, 443, 22, 445}
 
 // tcpProbeTimeout TCP 探测超时时间（较短，只做存活判断）
-const tcpProbeTimeout = 2 * time.Second
+const tcpProbeTimeout = 1 * time.Second
 
 // tcpProbeThreshold TCP 补充探测触发阈值
 // 当 ICMP 响应率低于此值时，自动启用 TCP 补充探测
 const tcpProbeThreshold = 0.1 // 10%
 
-// tcpProbeAlive 使用 TCP 探测主机是否存活
-// 尝试连接常用端口，任一端口响应即认为存活
+// tcpProbeAlive 使用 TCP 并行探测主机是否存活
+// 同时连接所有常用端口，任一响应即返回
 func tcpProbeAlive(ctx context.Context, session *common.ScanSession, host string) bool {
+	ctx, cancel := context.WithCancel(ctx)
+	defer cancel()
+
+	result := make(chan bool, len(tcpProbeCommonPorts))
 	for _, port := range tcpProbeCommonPorts {
-		addr := fmt.Sprintf("%s:%d", host, port)
-		conn, err := session.DialTCP(ctx, "tcp", addr, tcpProbeTimeout)
-		if err == nil {
-			_ = conn.Close()
+		go func(p int) {
+			addr := fmt.Sprintf("%s:%d", host, p)
+			conn, err := session.DialTCP(ctx, "tcp", addr, tcpProbeTimeout)
+			if err == nil {
+				_ = conn.Close()
+				result <- true
+				return
+			}
+			result <- false
+		}(port)
+	}
+
+	for range tcpProbeCommonPorts {
+		if <-result {
 			return true
 		}
 	}
@@ -709,10 +727,10 @@ func runTcpProbeForHosts(ctx context.Context, hosts []string, session *common.Sc
 	var mu sync.Mutex
 	aliveHosts := make([]string, 0)
 
-	// 并发控制，避免资源耗尽
-	concurrency := 50
-	if len(hosts) < concurrency {
-		concurrency = len(hosts)
+	// 并发控制，根据主机数动态调整，上限 200
+	concurrency := len(hosts)
+	if concurrency > 200 {
+		concurrency = 200
 	}
 	limiter := make(chan struct{}, concurrency)
 
diff --git a/core/port_scan.go b/core/port_scan.go
index 6459b7b..2d48d4c 100644
--- a/core/port_scan.go
+++ b/core/port_scan.go
@@ -286,9 +286,9 @@ func connectWithRetry(ctx context.Context, session *common.ScanSession, addr str
 		// 记录资源耗尽错误
 		session.State.IncrementResourceExhaustedCount()
 
-		// 指数退避：第1次等50ms，第2次等150ms
+		// 指数退避：200ms → 600ms → 1200ms
 		if attempt < maxRetries-1 {
-			waitTime := time.Duration(50*(attempt+1)) * time.Millisecond
+			waitTime := time.Duration(200*(1<<uint(attempt))) * time.Millisecond
 			time.Sleep(waitTime)
 		}
 	}
@@ -350,7 +350,7 @@ func buildServiceLogMessage(addr string, serviceInfo *ServiceInfo, isWeb bool) s
 func scanSinglePort(ctx context.Context, host string, port int, addr string, timeout time.Duration, count *int64, collector *resultCollector, failedCollector *failedPortCollector, session *common.ScanSession) {
 	config := session.Config
 	// 步骤1：建立连接
-	conn, err := connectWithRetry(ctx, session, addr, timeout, 3)
+	conn, err := connectWithRetry(ctx, session, addr, timeout, 2)
 	if err != nil {
 		handleConnectionFailure(err, host, port, addr, failedCollector)
 		return
@@ -369,7 +369,7 @@ func scanSinglePort(ctx context.Context, host string, port int, addr string, tim
 	if common.IsProxyEnabled() && verifyMethod != "direct" {
 		_ = conn.Close()
 		// 重新建立干净的连接用于服务识别
-		conn, err = connectWithRetry(ctx, session, addr, timeout, 3)
+		conn, err = connectWithRetry(ctx, session, addr, timeout, 2)
 		if err != nil {
 			handleConnectionFailure(err, host, port, addr, failedCollector)
 			return
diff --git a/core/service_probe.go b/core/service_probe.go
index 521d09c..55519c9 100644
--- a/core/service_probe.go
+++ b/core/service_probe.go
@@ -16,7 +16,7 @@ import (
 
 // 默认超时时间常量
 const (
-	defaultTotalWaitMS = 6000 // Nmap 默认等待时间
+	defaultTotalWaitMS = 3000 // 服务探测默认等待时间
 	defaultIntensity   = 7    // 默认探测强度 (1-9)
 )
 
diff --git a/core/service_probe_strategy_test.go b/core/service_probe_strategy_test.go
index 5ab6b77..a603d36 100644
--- a/core/service_probe_strategy_test.go
+++ b/core/service_probe_strategy_test.go
@@ -176,8 +176,8 @@ func TestSmartPortInfoScanner_Creation(t *testing.T) {
 // TestDefaultConstants 验证默认常量值
 func TestDefaultConstants(t *testing.T) {
 	// 验证默认等待时间
-	if defaultTotalWaitMS != 6000 {
-		t.Errorf("defaultTotalWaitMS 应该是 6000，实际是 %d", defaultTotalWaitMS)
+	if defaultTotalWaitMS != 3000 {
+		t.Errorf("defaultTotalWaitMS 应该是 3000，实际是 %d", defaultTotalWaitMS)
 	}
 
 	// 验证默认 intensity