when Printing a lot of jobs with high speed, OS get message timeout, job stop with "pending"

[qiangdong]

Bug Description

Ubuntu 16.04LTS
OS Version： 16.04
CUPS Version： 2.2.7
application: ORCA V5.0

when Printing a lot of jobs with high speed, OS get message timeout, job stop with "pending"

We(RICOH printer driver developer) are report a problem from our printer users:
I print ORCAfile with Ubuntu 16.04, CUPS 2.2.7 environment.

I print a lot of jobs with default speed mode,jobs can be printed, but when I print with high speed mode, job suddenly stop with "pending",

I figure out when all the print jobs can not be printed, I reprint one job but it can be printed ok

I view the "CUPS Error Log", it shows that there is one points which maybe the reasons that makes the print job "pending"

Reasons:
----------------------------------------------------------------------------
we find the error job number,it happned when get printers massage,waiting time 12 seconds,but normal job use 1 second

Error job
D [11/Sep/2020:09:57:28 +0900] [Job 9531] CUPS_SC_CMD_SNMP_GET: 38 (.1.3.6.1.4.1.367.3.2.1.2.18.2.1.7.1.3)
…
d [11/Sep/2020:09:57:30 +0900] select_timeout(0): 11 seconds to start pending jobs
…
D [11/Sep/2020:09:57:40 +0900] [Job 9531] CUPS_SC_CMD_SNMP_GET: 38 (.1.3.6.1.4.1.367.3.2.1.2.18.2.1.7.1.4)
…
d [11/Sep/2020:09:57:42 +0900] select_timeout(0): 11 seconds to start pending jobs
…
D [11/Sep/2020:09:57:52 +0900] [Job 9531] Waiting for status monitor to stop

Normal job
D [11/Sep/2020:09:56:35 +0900] [Job 9530] CUPS_SC_CMD_SNMP_GET: 38 (.1.3.6.1.4.1.367.3.2.1.2.18.2.1.7.1.3)
…
D [11/Sep/2020:09:56:36 +0900] [Job 9530] CUPS_SC_CMD_SNMP_GET: 38 (.1.3.6.1.4.1.367.3.2.1.2.18.2.1.7.1.4)
…
D [11/Sep/2020:09:56:36 +0900] [Job 9530] Waiting for status monitor to stop

when printer receive data,the default waiting time is 15 seconds,
but when the OS print job as the waiting time more than 15 seconds without sending data,
then the printer cannel the job

Drivers:
https://support.ricoh.com/bbv2/html/dr_ut_d/ipsio/history/w/bb/pub_j/dr_ut_d/4101033/4101033231/V503/5216152/ricohsg3200_7200_5.0.3-0_i386/history.htm

Our question is:
1. why there were 12 seconds waitting time?
2. Do you have any plan to improve the performance of printing on Ubuntu 16.04?
3. Do you have any workaround before this problems fixed?