TP-Link TL-WN881ND has high ping on Debian. What can be wrong?

Question

Debian

Hello gentlemen. I purchased a TP-Link TL-WN881ND WiFi adapter (2nd revision) to work as an access point (hostapd) on Debian 9 ("Stretch") OS. The 2nd revision differs from the first one in that the 2nd is based on the Realtek RTL8192EE chip, while the 1st is based on the Qualcomm Atheros AR9287 chip.
lspci output:

...
01:00.0 Network controller: Realtek Semiconductor Co., Ltd. RTL8192EE PCIe Wireless Network Adapter
...

lsmod output | grep rtl8192ee:

...
rtl8192ee             114688  0
btcoexist             172032  1 rtl8192ee
rtl_pci                36864  1 rtl8192ee
rtlwifi               102400  3 rtl_pci,btcoexist,rtl8192ee
mac80211              856064  3 rtl_pci,rtlwifi,rtl8192ee
...

The point, in fact, is this: the 2nd revision of the adapter has a high and uneven ping (minimum 25 ms, maximum 126 ms):

PING ya.ru (87.250.250.242) 56(84) bytes of data.
64 bytes from ya.ru (87.250.250.242): icmp_seq=1 ttl=58 time=101 ms
64 bytes from ya.ru (87.250.250.242): icmp_seq=2 ttl=58 time=125 ms
64 bytes from ya.ru (87.250.250.242): icmp_seq=3 ttl=58 time=45.8 ms
64 bytes from ya.ru (87.250.250.242): icmp_seq=4 ttl=58 time=68.2 ms
64 bytes from ya.ru (87.250.250.242): icmp_seq=5 ttl=58 time=91.1 ms
64 bytes from ya.ru (87.250.250.242): icmp_seq=6 ttl=58 time=114 ms
64 bytes from ya.ru (87.250.250.242): icmp_seq=7 ttl=58 time=34.7 ms
64 bytes from ya.ru (87.250.250.242): icmp_seq=8 ttl=58 time=57.1 ms
64 bytes from ya.ru (87.250.250.242): icmp_seq=9 ttl=58 time=80.1 ms
64 bytes from ya.ru (87.250.250.242): icmp_seq=10 ttl=58 time=103 ms
64 bytes from ya.ru (87.250.250.242): icmp_seq=11 ttl=58 time=126 ms
64 bytes from ya.ru (87.250.250.242): icmp_seq=12 ttl=58 time=46.8 ms
64 bytes from ya.ru (87.250.250.242): icmp_seq=13 ttl=58 time=69.2 ms
64 bytes from ya.ru (87.250.250.242): icmp_seq=14 ttl=58 time=92.2 ms
64 bytes from ya.ru (87.250.250.242): icmp_seq=15 ttl=58 time=115 ms
64 bytes from ya.ru (87.250.250.242): icmp_seq=16 ttl=58 time=35.8 ms
64 bytes from ya.ru (87.250.250.242): icmp_seq=17 ttl=58 time=58.1 ms
64 bytes from ya.ru (87.250.250.242): icmp_seq=18 ttl=58 time=81.1 ms
64 bytes from ya.ru (87.250.250.242): icmp_seq=19 ttl=58 time=104 ms
64 bytes from ya.ru (87.250.250.242): icmp_seq=20 ttl=58 time=92.2 ms
64 bytes from ya.ru (87.250.250.242): icmp_seq=21 ttl=58 time=47.6 ms
64 bytes from ya.ru (87.250.250.242): icmp_seq=22 ttl=58 time=70.1 ms
64 bytes from ya.ru (87.250.250.242): icmp_seq=23 ttl=58 time=93.2 ms
64 bytes from ya.ru (87.250.250.242): icmp_seq=24 ttl=58 time=57.8 ms
64 bytes from ya.ru (87.250.250.242): icmp_seq=25 ttl=58 time=36.0 ms
64 bytes from ya.ru (87.250.250.242): icmp_seq=26 ttl=58 time=59.1 ms
64 bytes from ya.ru (87.250.250.242): icmp_seq=27 ttl=58 time=80.0 ms
64 bytes from ya.ru (87.250.250.242): icmp_seq=28 ttl=58 time=85.4 ms
64 bytes from ya.ru (87.250.250.242): icmp_seq=29 ttl=58 time=25.4 ms
64 bytes from ya.ru (87.250.250.242): icmp_seq=30 ttl=58 time=48.0 ms

--- ya.ru ping statistics ---
30 packets transmitted, 30 received, 0% packet loss, time 29041ms
rtt min/avg/max/mdev = 25.487/74.892/126.296/28.050 ms

And this is all only in normal operation. In access point mode, ping sometimes reaches 5 (!) seconds.
The adapter of the 1st revision on the AR9287 chip has no problems with this either in normal mode or in access point mode.
Now the question is: is it possible to somehow improve the performance of the 2nd revision adapter?

Answer 1

try disabling power management and check:
sudo iwconfig wlan0 power off

Answer 2

This is either a reflection of the radio signal or packet fragmentation. You can check the fragmentation like this ping www.yandex.ru -4 -l 65500 try updating the drivers