fs_clone slow performance

EBS R12.2.11 on DB19.15 single instance

I had a run of an ADOP with phase fs_clone on our 12.2.11 environment, and I'm wondering where it is spending that time and if that can go faster. 

34 minutes in environment A and 62 minutes in environment B. There is a difference of about double.

environment A：

(34Min Finish）　24分08秒

05:57:39 00:08:15 ad.plsql.ad_zd_sys.alter_logon_trigger EVENT Alter logon trigger: DISABLE

06:21:47 00:24:08 ad.plsql.ad_zd_sys.alter_logon_trigger EVENT Alter logon trigger: enable

(62Min Finish） 42分59秒

09:42:33 00:16:27 ad.plsql.ad_zd_sys.alter_logon_trigger EVENT Alter logon trigger: DISABLE

10:25:32 00:42:59 ad.plsql.ad_zd_sys.alter_logon_trigger EVENT Alter logon trigger: enable