diff --git a/src/target/target/lm3s6965.cfg b/src/target/target/lm3s6965.cfg
index 9b21cba0e..f7ea0abb5 100644
--- a/src/target/target/lm3s6965.cfg
+++ b/src/target/target/lm3s6965.cfg
@@ -1,3 +1,8 @@
+# script for luminary lm3s6965
+
+# jtag speed
+jtag_khz 500
+
 jtag_nsrst_delay 100
 jtag_ntrst_delay 100
 
diff --git a/src/target/target/lm3s811.cfg b/src/target/target/lm3s811.cfg
index 9d13d7b1a..f050c2974 100644
--- a/src/target/target/lm3s811.cfg
+++ b/src/target/target/lm3s811.cfg
@@ -1,3 +1,8 @@
+# Script for luminary lm3s811
+
+# jtag speed
+jtag_khz 500
+
 jtag_nsrst_delay 100
 jtag_ntrst_delay 100
 
diff --git a/src/target/target/stm32.cfg b/src/target/target/stm32.cfg
index 371e4ab3d..7779f19a2 100644
--- a/src/target/target/stm32.cfg
+++ b/src/target/target/stm32.cfg
@@ -1,3 +1,8 @@
+# script for stm32
+
+# jtag speed
+jtag_khz 500
+
 jtag_nsrst_delay 100
 jtag_ntrst_delay 100
 
diff --git a/src/target/target/stm32stick.cfg b/src/target/target/stm32stick.cfg
index 37a282aaa..36192c8e4 100644
--- a/src/target/target/stm32stick.cfg
+++ b/src/target/target/stm32stick.cfg
@@ -1,4 +1,8 @@
 # Hitex stm32 performance stick
+
+# set jtag speed
+jtag_khz 500
+
 jtag_nsrst_delay 100
 jtag_ntrst_delay 100
 
diff --git a/src/target/target/str710.cfg b/src/target/target/str710.cfg
index 18a479503..2057ef003 100644
--- a/src/target/target/str710.cfg
+++ b/src/target/target/str710.cfg
@@ -1,5 +1,5 @@
 #start slow, speed up after reset
-jtag_khz 10, 16000
+jtag_khz 10, 6000
 
 #use combined on interfaces or targets that can't set TRST/SRST separately
 reset_config trst_and_srst srst_pulls_trst
diff --git a/src/target/target/str730.cfg b/src/target/target/str730.cfg
index 083701809..9965fa3d9 100644
--- a/src/target/target/str730.cfg
+++ b/src/target/target/str730.cfg
@@ -1,5 +1,7 @@
 #STR730 CPU
 
+jtag_khz 10, 3000
+
 #use combined on interfaces or targets that can’t set TRST/SRST separately
 #reset_config trst_and_srst srst_pulls_trst
 reset_config trst_and_srst srst_pulls_trst
diff --git a/src/target/target/str750.cfg b/src/target/target/str750.cfg
index 33136d864..c87f5d090 100644
--- a/src/target/target/str750.cfg
+++ b/src/target/target/str750.cfg
@@ -1,5 +1,8 @@
 #STR750 CPU
 
+# jtag speed
+jtag_khz 10, 3000
+
 #use combined on interfaces or targets that can’t set TRST/SRST separately
 #reset_config trst_and_srst srst_pulls_trst
 reset_config trst_and_srst srst_pulls_trst
diff --git a/src/target/target/str912.cfg b/src/target/target/str912.cfg
index 8200c0f01..fc61bc1e5 100644
--- a/src/target/target/str912.cfg
+++ b/src/target/target/str912.cfg
@@ -1,8 +1,11 @@
+# script for str9
+
+# jtag speed
+jtag_khz 16 3000
+
 jtag_nsrst_delay 100
 jtag_ntrst_delay 100
 
-jtag_khz 16 2000
-
 #use combined on interfaces or targets that can't set TRST/SRST separately
 reset_config trst_and_srst
 
diff --git a/src/target/target/str9comstick.cfg b/src/target/target/str9comstick.cfg
index 9375b77d3..71664567b 100644
--- a/src/target/target/str9comstick.cfg
+++ b/src/target/target/str9comstick.cfg
@@ -1,4 +1,8 @@
 #Hitex STR9 Comstick
+
+# set jtag speed
+jtag_khz 3000
+
 jtag_nsrst_delay 100
 jtag_ntrst_delay 100
 #use combined on interfaces or targets that can’t set TRST/SRST separately