i have issue with my Clint about Bandwidth

i create vlan in mikrotik and connect to switch cisco , i create sample queue for vlan Max Limit :10M/10M upload /download and queue type: Default and total queue type: default , when test it by speed test i got 4M download 1M upload
why happen like that .

You need to provide a whole lot more details about your "test" before anyone can be of any real assistance.

this my setup

/interface vlan
add name=VLAN-100 interface=ether11 vlan-id=100
add address=192.168.10.1/30 interface=VLAN-100
/queue simple
Add name="VLAN100" target-addresses=192.168.10.2/30 interface=VLAN-100 parent=none
packet-marks="" direction=both priority=8
queue=default-small/default-small limit-at=0/0 max-limit=10M/10M
burst-limit=0/0 burst-threshold=0/0 burst-time=0s/0s
total-queue=default-small