I can’t limit 
I mark connection and packets and create a simple queue or tree but no limit:
Retrieving speedtest.net configuration…
Testing from (77.XX.XX.10)…
Retrieving speedtest.net server list…
Selecting best server based on ping…
Hosted by Guillena WiFi (Guillena) [12.08 km]: 4.861 ms
Testing download speed…
Download: 93.66 Mbit/s
Testing upload speed…
Upload: 61.54 Mbit/s
And i use this config (same this post):
/ip firewall mangle
Flags: X - disabled, I - invalid, D - dynamic
3 chain=postrouting action=mark-connection new-connection-mark=Download_conn dst-address=77.XX.XX.10
4 chain=postrouting action=mark-packet new-packet-mark=Download_packets passthrough=no connection-mark=Download_conn
5 chain=prerouting action=mark-connection new-connection-mark=Upload_conn src-address=77.XX.XX.10
6 chain=prerouting action=mark-packet new-packet-mark=Upload_packets passthrough=no connection-mark=Upload_conn
/queue tree
Flags: X - disabled, I - invalid
0 name=“500M_Download” parent=ether3 packet-mark=“” limit-at=0 queue=default priority=8 max-limit=1M burst-limit=0 burst-threshold=0 burst-time=0s bucket-size=0.1
1 name=“500M_Upload” parent=ether3 packet-mark=“” limit-at=0 queue=default priority=8 max-limit=1M burst-limit=0 burst-threshold=0 burst-time=0s bucket-size=0.1
2 name=“Download” parent=500M_Download packet-mark=Download_packets limit-at=0 queue=default priority=8 max-limit=1M burst-limit=0 burst-threshold=0 burst-time=0s bucket-size=0.1
3 name=“Upload” parent=500M_Upload packet-mark=Upload_packets limit-at=0 queue=default priority=8 max-limit=1M burst-limit=0 burst-threshold=0 burst-time=0s bucket-size=0.1
/queue simple
Flags: X - disabled, I - invalid, D - dynamic
0 name=“queue2” target=ether3 parent=none packet-marks=Download_packets priority=8/8 queue=default/default limit-at=1M/1M max-limit=1M/1M burst-limit=0/0 burst-threshold=0/0 burst-time=0s/0s bucket-size=0.1/0.1
1 name=“queue3” target=ether3 parent=none packet-marks=Upload_packets priority=8/8 queue=default/default limit-at=1M/1M max-limit=1M/1M burst-limit=0/0 burst-threshold=0/0 burst-time=0s/0s bucket-size=0.1/0.1
2 name=“queue4” target=77.XX.XX.10/32 parent=none packet-marks=Download_packets priority=8/8 queue=default/default limit-at=1M/1M max-limit=1M/1M burst-limit=0/0 burst-threshold=0/0 burst-time=0s/0s bucket-size=0.1/0.1
3 name=“queue5” target=77.XX.XX.10/32 parent=none packet-marks=Upload_packets priority=8/8 queue=default/default limit-at=1M/1M max-limit=1M/1M burst-limit=0/0 burst-threshold=0/0 burst-time=0s/0s bucket-size=0.1/0.1
This router offer public IP to interfaces.