baeglebone openssl rsa vs nistp256

Architecture:        armv7l
Byte Order:          Little Endian
CPU(s):              1
On-line CPU(s) list: 0
Thread(s) per core:  1
Core(s) per socket:  1
Socket(s):           1
Vendor ID:           ARM
Model:               2
Model name:          Cortex-A8
Stepping:            r3p2
CPU max MHz:         1000.0000
CPU min MHz:         300.0000
BogoMIPS:            996.14
Flags:               half thumb fastmult vfp edsp neon vfpv3 tls vfpd32
              total        used        free      shared  buff/cache   available
Mem:            499          28         267          29         204         430
Swap:             0           0           0
### openssl speed
Doing 2048 bits private rsa's for 10s: 588 2048 bits private RSA's in 10.00s
Doing 2048 bits public rsa's for 10s: 23057 2048 bits public RSA's in 9.99s
Doing 3072 bits private rsa's for 10s: 205 3072 bits private RSA's in 10.03s
Doing 3072 bits public rsa's for 10s: 10863 3072 bits public RSA's in 9.99s
Doing 4096 bits private rsa's for 10s: 94 4096 bits private RSA's in 10.01s
Doing 4096 bits public rsa's for 10s: 6298 4096 bits public RSA's in 10.00s
Doing 256 bits sign ecdsa's for 10s: 13793 256 bits ECDSA signs in 9.90s
Doing 256 bits verify ecdsa's for 10s: 4997 256 bits ECDSA verify in 9.99s
OpenSSL 1.1.1c  28 May 2019
built on: Thu May 30 15:27:48 2019 UTC
options:bn(64,32) rc4(char) des(long) aes(partial) blowfish(ptr)
compiler: gcc -fPIC -pthread -Wa,--noexecstack -Wall -Wa,--noexecstack -g -O2 -fdebug-prefix-map=/build/openssl-W4Fk52/openssl-1.1.1c=. -fstack-protector-strong -Wformat -Werror=format-security -DOPENSSL_USE_NODELETE -DOPENSSL_PIC -DOPENSSL_CPUID_OBJ -DOPENSSL_BN_ASM_MONT -DOPENSSL_BN_ASM_GF2m -DSHA1_ASM -DSHA256_ASM -DSHA512_ASM -DKECCAK1600_ASM -DAES_ASM -DBSAES_ASM -DGHASH_ASM -DECP_NISTZ256_ASM -DPOLY1305_ASM -DNDEBUG -Wdate-time -D_FORTIFY_SOURCE=2
                  sign    verify    sign/s verify/s
rsa 2048 bits 0.017007s 0.000433s     58.8   2308.0
rsa 3072 bits 0.048927s 0.000920s     20.4   1087.4
rsa 4096 bits 0.106489s 0.001588s      9.4    629.8
                              sign    verify    sign/s verify/s
 256 bits ecdsa (nistp256)   0.0007s   0.0020s   1393.2    500.2