Serial LTE Modem app in NCS main - too long to WAKEUP

NCS main, nRF9160 DK, PPK2

git log -n 1 --oneline
4f916da03 (HEAD -> main, origin/main, origin/HEAD) west.yml: rebase OSS trees

SLM prj.conf changes:
CONFIG_SLM_START_SLEEP=y
CONFIG_SLM_WAKEUP_PIN=6
CONFIG_SLM_INDICATE_PIN=2
CONFIG_NRF_MODEM_LIB_TRACE_ENABLED=y
It takes ~1,37s to WAKEUP nRF9160 SLM after RESET.
Expected time between WAKEUP and "Ready" is ~25ms.
[PPK2] Found PPK2 at COM9
[PPK2] DUT Powered, Measurement started
0.14 <RESET> Thu May 19 19:29:44 2022
1.04 [PPK2] 100k/s AVG 4.04 mA Max 20.2 mA
2.01 [PPK2] 100k/s AVG 2.02 mA Max 24.4 mA
3.03 [PPK2] 100k/s AVG 0.003mA Max 0.711mA
4.01 [PPK2] 100k/s AVG 0.005mA Max 0.711mA
5.05 [PPK2] 100k/s AVG 0.005mA Max 0.711mA
6.02 [PPK2] 100k/s AVG 0.003mA Max 0.711mA
7.01 [PPK2] 100k/s AVG 0.006mA Max 0.711mA
7.06 <WAKEUP>
8.02 [PPK2] 100k/s AVG 0.920mA Max 19.1 mA
8.43 [RX] Ready
8.43 [TX] AT
8.44 [RX] OK
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