[Nexus 7 (2013) General] casualuser:
OK guys, speedtest.net is NOT a good way to test your tablet/phone WiFi.

Lets do it in a bit more scientific way:

Nexus 7 (2013) LTE european edition, JLS36C build, list of relevant wifi chipset hardware capabilities:

root@deb:/data # ./iw list
Wiphy phy1
Band 1:
Capabilities: 0x9030
HT20
Static SM Power Save
RX Greenfield
RX HT20 SGI
No RX STBC
Max AMSDU length: 3839 bytes
DSSS/CCK HT40
L-SIG TXOP protection
Maximum RX AMPDU length 65535 bytes (exponent: 0x003)
Minimum RX AMPDU time spacing: 16 usec (0x07)
HT TX/RX MCS rate indexes supported: 0-7
......
Band 2:
Capabilities: 0x9072
HT20/HT40
Static SM Power Save
RX Greenfield
RX HT20 SGI
RX HT40 SGI
No RX STBC
Max AMSDU length: 3839 bytes
DSSS/CCK HT40
L-SIG TXOP protection
Maximum RX AMPDU length 65535 bytes (exponent: 0x003)
Minimum RX AMPDU time spacing: 16 usec (0x07)
HT TX/RX MCS rate indexes supported: 0-7

So in theory our tablet's wifi chipset supports 72.2Mbit/s on 2.4GHz frequencies and 150Mbit/s on 5.8Ghz frequencies. Keep in mind that the real life TCP/IP throughput of wifi is lower than theoretical link rate.

Now how does it deliver in practice - testing on TP-Link TL-WDR4300 router with latest stable OpenWRT, clear view distance to router ~2 meters, benchmark used is iperf with 1M buffer, tablet -> router -> gigabit server tranfers.

On 2.4GHz:

Station xxxxx (on wlan0)
inactive time: 0 ms
rx bytes: 306287131
rx packets: 200039
tx bytes: 4952341
tx packets: 57518
tx retries: 2059
tx failed: 0
signal: -47 [-48, -51] dBm
signal avg: -46 [-48, -51] dBm
tx bitrate: 72.2 MBit/s MCS 7 short GI
rx bitrate: 72.2 MBit/s MCS 7 short GI
authorized: yes
authenticated: yes
preamble: short
WMM/WME: yes
MFP: no
TDLS peer: no

[ 4] 107.0-108.0 sec 5.83 MBytes 48.9 Mbits/sec
[ 4] 108.0-109.0 sec 5.97 MBytes 50.0 Mbits/sec
[ 4] 109.0-110.0 sec 5.87 MBytes 49.3 Mbits/sec
[ 4] 110.0-111.0 sec 5.89 MBytes 49.4 Mbits/sec
[ 4] 111.0-112.0 sec 5.79 MBytes 48.5 Mbits/sec
[ 4] 112.0-113.0 sec 5.71 MBytes 47.9 Mbits/sec
[ 4] 113.0-114.0 sec 5.85 MBytes 49.1 Mbits/sec
[ 4] 114.0-115.0 sec 5.91 MBytes 49.6 Mbits/sec
[ 4] 115.0-116.0 sec 5.88 MBytes 49.4 Mbits/sec
[ 4] 116.0-117.0 sec 5.99 MBytes 50.3 Mbits/sec
[ 4] 117.0-118.0 sec 5.84 MBytes 49.0 Mbits/sec
[ 4] 118.0-119.0 sec 5.72 MBytes 48.0 Mbits/sec

On 5.8Ghz:

Station xxxxx (on wlan1)
inactive time: 0 ms
rx bytes: 1778217890
rx packets: 1159654
tx bytes: 50305376
tx packets: 583322
tx retries: 15589
tx failed: 321
signal: -51 [-60, -54, -53] dBm
signal avg: -50 [-58, -53, -53] dBm
tx bitrate: 150.0 MBit/s MCS 7 40Mhz short GI
rx bitrate: 150.0 MBit/s MCS 7 40Mhz short GI
authorized: yes
authenticated: yes
preamble: short
WMM/WME: yes
MFP: no
TDLS peer: no

[ 6] 125.0-126.0 sec 12.2 MBytes 102 Mbits/sec
[ 6] 126.0-127.0 sec 11.9 MBytes 99.6 Mbits/sec
[ 6] 127.0-128.0 sec 12.0 MBytes 100 Mbits/sec
[ 6] 128.0-129.0 sec 12.1 MBytes 101 Mbits/sec
[ 6] 129.0-130.0 sec 11.8 MBytes 99.0 Mbits/sec
[ 6] 130.0-131.0 sec 11.7 MBytes 98.6 Mbits/sec
[ 6] 131.0-132.0 sec 11.8 MBytes 99.3 Mbits/sec
[ 6] 132.0-133.0 sec 12.0 MBytes 101 Mbits/sec
[ 6] 133.0-134.0 sec 12.0 MBytes 101 Mbits/sec
[ 6] 134.0-135.0 sec 11.9 MBytes 99.6 Mbits/sec
[ 6] 135.0-136.0 sec 11.8 MBytes 98.6 Mbits/sec
[ 6] 136.0-137.0 sec 12.0 MBytes 100 Mbits/sec
[ 6] 137.0-138.0 sec 11.5 MBytes 96.8 Mbits/sec
[ 6] 138.0-139.0 sec 12.0 MBytes 101 Mbits/sec
[ 6] 139.0-140.0 sec 12.0 MBytes 101 Mbits/sec

So in conclusion, Nexus 7 2013 wifi is working as expected, delivers ~100 Mbit/sec real life TCP throughput on 5.8Ghz and ~50Mbit/sec on 2.4Ghz.