(1) Too swift arrives as tardy as too slow. 

(2) Heaven’s vengeance is slow but sure. 

(3) Slow help is no help.

(4) Slow and steady wins the race. Sentencedict.com 

(5) Confidence is a plant of slow growth. 

(6) God’s mill grinds slow but sure. 

(7) True friendship is a plant of slow growth. 

(8) Be swift to hear, slow to speak. 

(9) Be slow to promise and quick to perform. 

(10) Be slow in choosing a friend; slower in changing. 

(11) I am a slow walker, but I never walk backwards. 

(12) Those who are quick to promise are generally slow to perform. 

(13) The car was travelling at a very slow speed.

(14) Slow down - you're breaking the speed limit.

(15) The slow movement is wonderfully moody and rhapsodic.

(16) He walked with a slow stiff gait.

(17) She had the slow, soft voice of a countrywoman.

(18) We are making slow but steady progress.

(19) Before turning, you should slow down your car.

(20) This is the slow lane of a motorway.

(21) The traffic was moving at a slow crawl.

(22) Collecting data is a painfully slow process.

(23) She has a slow, deliberate way of talking.

(24) The piece ends with a truly poetic slow movement.

(25) He died a slow and painful death.

(26) Unloading the cargo was a slow process.

(27) "Howdy, pardner," he said in his slow Texan drawl.

(28) Slow down - you're driving too fast.

(29) Slow down, you two, you're walking too fast!

(30) Maidens should (or must) be mild and meek, swift to hear and slow to speak.