we have one primary and 3 secondary nodes (first 2 is sync mode and last 2 in async mode). please see the attachment and suggest what can be done to fix lag issue
we are seeing the lag in the last node (10+ hrs)

Oldest active transaction:
SPID (server process ID): 201s
UID (user ID) : -1
Name : ReorderPages
LSN : (1192075:655776:1)
Start time : Jun 25 2021 2:03:00:440AM
SID : 0x010500000000000515000000ff4e7d090240be3d240db112adad0100
Replicated Transaction Information:
Oldest distributed LSN : (1191145:913922:72)
Oldest non-distributed LSN : (1191163:100428:1)
DBCC execution completed. If DBCC printed error messages, contact your system administrator.
Completion time: 2021-06-25T14:30:06.0476015-07:00