How are Mendix concurrent sessions counted, and do they have an impact on performance?

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Hi, We have recently noticed that in our application the number of concurrent sessions recorded in the application log messages is jumping up by large amounts. We only noticed as we had a performance issue that lead to huge jump in CPU usage. Could this have had an impact on our performance, or is it something else? Below is a copy of the logs over a 2-3 min period :- Jul 27 14:58:29 127.0.0.1 lvbrokerp: INFO - WebUI: Anonymous user 'Anonymous_aa60e8e5-7592-447c-a247-b02837ebd5e4' created (Number of concurrent sessions: 124). Jul 27 14:58:42 127.0.0.1 lvbrokerp: INFO - WebUI: Anonymous user 'Anonymous_43326177-0841-457f-857f-f9a9ed3e1040' created (Number of concurrent sessions: 125). Jul 27 14:58:47 127.0.0.1 lvbrokerp: INFO - Connector: New login request from [Source-IP: XXX.0.0.1, X-Forwarded-For: XX.XXX.XXX.52, User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; Trident/7.0; rv:11.0) like Gecko] Jul 27 14:58:48 127.0.0.1 lvbrokerp: INFO - WebUI: Login FAILED: invalid password for user 'user1@test.co.uk' (1 failed login). Jul 27 14:58:52 127.0.0.1 lvbrokerp: INFO - Multi Add Vehicle: (1/8) AA01ZZZ Jul 27 14:58:52 127.0.0.1 lvbrokerp: INFO - Multi Add Vehicle: (2/8) BB02YYY Jul 27 14:58:52 127.0.0.1 lvbrokerp: INFO - Multi Add Vehicle: (3/8) CC02XXX Jul 27 14:58:52 127.0.0.1 lvbrokerp: INFO - Multi Add Vehicle: (4/8) DD60WWW Jul 27 14:58:52 127.0.0.1 lvbrokerp: INFO - Multi Add Vehicle: (5/8) EE12VVV Jul 27 14:58:52 127.0.0.1 lvbrokerp: INFO - Multi Add Vehicle: (6/8) FF61UUU Jul 27 14:58:52 127.0.0.1 lvbrokerp: INFO - Multi Add Vehicle: (7/8) GG13TTT Jul 27 14:58:52 127.0.0.1 lvbrokerp: INFO - Multi Add Vehicle: (8/8) HH07SSS Jul 27 14:59:05 127.0.0.1 lvbrokerp: INFO - WebUI: Anonymous user 'Anonymous_0363eb2b-5b3a-4447-a701-0876b8ba14eb' created (Number of concurrent sessions: 128). Jul 27 14:59:18 127.0.0.1 lvbrokerp: INFO - Connector: New login request from [Source-IP: XXX.0.0.1, X-Forwarded-For: XXX.XXX.XXX.138, User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:45.0) Gecko/20100101 Firefox/45.0] Jul 27 14:59:19 127.0.0.1 lvbrokerp: INFO - WebUI: Login OK: user 'user4@test.co.uk' (Number of concurrent sessions: 149). Jul 27 14:59:29 127.0.0.1 lvbrokerp: INFO - WebUI: Anonymous user 'Anonymous_170e9409-6715-4484-bf6c-979f190f5d54' created (Number of concurrent sessions: 169). Jul 27 14:59:32 127.0.0.1 lvbrokerp: INFO - WebUI: Anonymous user 'Anonymous_cf44aa7c-eb2d-45b3-8be4-48be46af3cbf' created (Number of concurrent sessions: 175). Jul 27 14:59:47 127.0.0.1 lvbrokerp: INFO - WebUI: Anonymous user 'Anonymous_40bdf381-2a7a-4817-9a61-690f793d707b' created (Number of concurrent sessions: 202). Jul 27 14:59:50 127.0.0.1 lvbrokerp: INFO - Connector: New login request from [Source-IP: XXX.0.0.1, X-Forwarded-For: XXX.XX.XXX.226, User-Agent: Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/51.0.2704.103 Safari/537.36] Jul 27 14:59:50 127.0.0.1 lvbrokerp: INFO - WebUI: Login OK: user 'user3@test.com' (Number of concurrent sessions: 210). Jul 27 15:00:04 127.0.0.1 lvbrokerp: INFO - WebUI: Anonymous user 'Anonymous_39e67dbe-3dae-4d23-a3e1-11f45ec928f6' created (Number of concurrent sessions: 252). Jul 27 15:00:21 127.0.0.1 lvbrokerp: INFO - Connector: New login request from [Source-IP: XXX.0.0.1, X-Forwarded-For: XXX.XX.XX.147, User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; Trident/7.0; rv:11.0) like Gecko] Jul 27 15:00:21 127.0.0.1 lvbrokerp: INFO - WebUI: Login OK: user 'user2@test.co.uk' (Number of concurrent sessions: 284). Jul 27 15:00:36 127.0.0.1 lvbrokerp: INFO - Connector: New login request from [Source-IP: XXX.0.0.1, X-Forwarded-For: XX.XXX.XXX.52, User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; Trident/7.0; rv:11.0) like Gecko] Jul 27 15:00:36 127.0.0.1 lvbrokerp: INFO - WebUI: Login OK: user 'user1@test.co.uk' (Number of concurrent sessions: 304). Jul 27 15:01:09 127.0.0.1 lvbrokerp: INFO - WebUI: Anonymous user 'Anonymous_cbdc68c4-927e-41e1-a7b9-01346a2a414e' created (Number of concurrent sessions: 358). Jul 27 15:01:16 127.0.0.1 lvbrokerp: INFO - Core: Removing session for user 'user@test.co.uk' Jul 27 15:01:17 127.0.0.1 lvbrokerp: INFO - WebUI: Anonymous user 'Anonymous_0c398672-15c6-4831-bfa5-9a00ffe5e5cb' created (Number of concurrent sessions: 372). Thanks in advance, Stephen
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