The iperf bounceback test does not overload the network capacity so-to-speak. It's a responsiveness test and not a capacity test. Most networks today are now limited by responsiveness and not so much link capacity. The goal is to continuously measure responsiveness as a time series (without impact, i.e. mitigate "observe is to disturb") and report issues ahead of user complaints.
Here's an example on a 10G link, the average consumed throughput is 16Kbit/sec. Same for a run to my server on the real internet over a last mile, internet access link. The RPS metric indicates the responsiveness which can be extrapolated to others competing for the WiFi TXOP arbitrations.
[root@ryzen3950 iperf2-code]# iperf -c 192.168.1.87 -i 1 --bounceback -e
------------------------------------------------------------
Client connecting to 192.168.1.87, TCP port 5001 with pid 1322315 (1 flows)
Write buffer size: 100 Byte
Bursting: 100 Byte writes 10 times every 1.00 second(s)
Bounce-back test (size= 100 Byte) (server hold req=0 usecs)
TOS set to 0x0 and nodelay (Nagle off)
TCP window size: 16.0 KByte (default)
------------------------------------------------------------
[ 1] local 192.168.1.96%enp4s0 port 39156 connected with 192.168.1.87 port 5001 (bb len/hold=100/0) (sock=3) (icwnd/mss/irtt=14/1448/432) (ct=0.55 ms) on 2022-08-08 16:21:35 (PDT)
[ ID] Interval Transfer Bandwidth BB cnt=avg/min/max/stdev Rtry Cwnd/RTT RPS
[ 1] 0.00-1.00 sec 1.95 KBytes 16.0 Kbits/sec 10=0.198/0.112/0.609/0.149 ms 0 14K/199 us 5035 rps
[ 1] 1.00-2.00 sec 1.95 KBytes 16.0 Kbits/sec 10=0.184/0.090/0.412/0.098 ms 0 14K/156 us 5379 rps
[ 1] 2.00-3.00 sec 1.95 KBytes 16.0 Kbits/sec 10=0.448/0.236/1.081/0.233 ms 0 14K/332 us 2208 rps
[ 1] 3.00-4.00 sec 1.95 KBytes 16.0 Kbits/sec 10=0.317/0.152/0.972/0.253 ms 0 14K/283 us 3116 rps
[ 1] 4.00-5.00 sec 1.95 KBytes 16.0 Kbits/sec 10=0.194/0.095/0.378/0.078 ms 0 14K/191 us 5109 rps
[ 1] 5.00-6.00 sec 1.95 KBytes 16.0 Kbits/sec 10=0.472/0.170/1.326/0.314 ms 0 14K/333 us 2100 rps
[ 1] 6.00-7.00 sec 1.95 KBytes 16.0 Kbits/sec 10=0.438/0.163/1.158/0.278 ms 0 14K/339 us 2262 rps
[ 1] 7.00-8.00 sec 1.95 KBytes 16.0 Kbits/sec 10=0.460/0.304/0.973/0.187 ms 0 14K/379 us 2155 rps
[ 1] 8.00-9.00 sec 1.95 KBytes 16.0 Kbits/sec 10=0.450/0.282/0.989/0.200 ms 0 14K/390 us 2207 rps
[ 1] 9.00-10.00 sec 1.95 KBytes 16.0 Kbits/sec 10=0.469/0.319/1.079/0.219 ms 0 14K/404 us 2110 rps
[ 1] 0.00-10.01 sec 19.5 KBytes 16.0 Kbits/sec 100=0.363/0.090/1.326/0.236 ms 0 14K/476 us 2730 rps
[ 1] 0.00-10.01 sec BB8(f)-PDF: bin(w=100us):cnt(100)=1:3,2:18,3:22,4:13,5:35,6:1,7:1,10:3,11:2,12:1,14:1 (5.00/95.00/99.7%=2/10/14,Outliers=0,obl/obu=0/0)
[root@ryzen3950 iperf2-code]# iperf -c <hostame> -i 1 --bounceback -e --hide-ips
------------------------------------------------------------
Client connecting to (**hidden**), TCP port 5001 with pid 1322678 (1 flows)
Write buffer size: 100 Byte
Bursting: 100 Byte writes 10 times every 1.00 second(s)
Bounce-back test (size= 100 Byte) (server hold req=0 usecs)
TOS set to 0x0 and nodelay (Nagle off)
TCP window size: 16.0 KByte (default)
------------------------------------------------------------
[ 1] local *.*.*.96%enp4s0 port 38184 connected with *.*.*.123 port 5001 (bb len/hold=100/0) (sock=3) (icwnd/mss/irtt=14/1448/10503) (ct=10.66 ms) on 2022-08-08 16:24:49 (PDT)
[ ID] Interval Transfer Bandwidth BB cnt=avg/min/max/stdev Rtry Cwnd/RTT RPS
[ 1] 0.00-1.00 sec 1.95 KBytes 16.0 Kbits/sec 10=11.535/9.189/14.642/2.416 ms 0 14K/10772 us 86 rps
[ 1] 1.00-2.00 sec 1.95 KBytes 16.0 Kbits/sec 10=11.064/9.418/14.457/2.288 ms 0 14K/10601 us 90 rps
[ 1] 2.00-3.00 sec 1.95 KBytes 16.0 Kbits/sec 10=11.178/9.113/14.746/2.194 ms 0 14K/10682 us 89 rps
[ 1] 3.00-4.00 sec 1.95 KBytes 16.0 Kbits/sec 10=11.388/9.584/14.568/2.100 ms 0 14K/10819 us 87 rps
[ 1] 4.00-5.00 sec 1.95 KBytes 16.0 Kbits/sec 10=11.472/9.911/14.807/2.032 ms 0 14K/10905 us 87 rps
[ 1] 5.00-6.00 sec 1.95 KBytes 16.0 Kbits/sec 10=11.579/9.816/14.982/2.176 ms 0 14K/11083 us 86 rps
[ 1] 6.00-7.00 sec 1.95 KBytes 16.0 Kbits/sec 10=10.968/9.394/14.364/1.803 ms 0 14K/10681 us 91 rps
[ 1] 7.00-8.00 sec 1.95 KBytes 16.0 Kbits/sec 10=11.145/9.649/16.134/2.224 ms 0 14K/10725 us 89 rps
[ 1] 8.00-9.00 sec 1.95 KBytes 16.0 Kbits/sec 10=10.646/9.373/14.586/1.870 ms 0 14K/10373 us 93 rps
[ 1] 9.00-10.00 sec 1.95 KBytes 16.0 Kbits/sec 10=10.705/9.017/14.219/1.887 ms 0 14K/10519 us 93 rps
[ 1] 0.00-10.03 sec 19.5 KBytes 16.0 Kbits/sec 100=11.168/9.017/16.134/2.034 ms 0 14K/10931 us 89 rps
[ 1] 0.00-10.03 sec BB8(f)-PDF: bin(w=100us):cnt(100)=91:1,92:2,93:1,94:6,95:7,96:2,97:6,98:5,99:7,100:9,101:5,102:4,103:5,104:2,105:1,106:1,107:2,108:1,113:2,119:1,122:1,123:1,127:1,128:1,137:1,139:2,140:1,141:1,142:3,143:4,144:6,145:1,146:2,147:1,148:1,149:1,150:1,162:1 (5.00/95.00/99.7%=94/147/162,Outliers=0,obl/obu=0/0)