Paired a router to the main router

[BuBu Shofronea]

I paired a TL-WR940N router to my main router which is ZTE F668 in order to boost my wifi signal in my house. I did this by linking a 100 mbit cable from the LAN port of the main to the LAN port of the secondary. With some software tweaks such as disabling DHCP, renaming local ip and selecting specifical wlan channels for each, i managed to get it working.
I linked my pc via cable to the secondary router and it works fine, at 100 mbps, but the issue is that i dont get the same speed quality as if i connect my pc to the main. This translates to packet loss in games and a higher ping, sometimes by 100m/s. Also wifi works slower, it has a weird thing that sometimes, for a couple of seconds, it hangs in loading things that require internet, sometimes lasting even more ( this only when im connected to the secondary router ).
Is there any tweak i can do so i can bring my secondary router as close as possible to the speeds of the main ? Thanks

 

[InvalidError]

When you daisy-chain routers using the LAN ports, traffic should be passing straight through the router's Ethernet switch and add next to no measurable delay to network latency. If you see packet loss and major latency issue, I'd suspect a bad cable or a defective switch/router.

 

[BuBu Shofronea]

When you daisy-chain routers using the LAN ports, traffic should be passing straight through the router's Ethernet switch and add next to no measurable delay to network latency. If you see packet loss and major latency issue, I'd suspect a bad cable or a defective switch/router.

the issue seems to be my secondary router as if i link the pc to the main with the same cable i linked the main to the secondary i get more than acceptable speeds. The cable that links the secondary to the pc is brand new i dont suspect it by any mean. I may try tomorrow swap the main with the secondary but i think the secondary is better than the main and i can't see why it would bottleneck my speeds or smth.