Webhook latency issue

Jenkins Verison: 2.263.4
Job Import plugin version: 2.1
OS: Centos 7
GitLab Branch Source - 1.5.9

We have been using GitLab Branch Source for Gitlab group and multibranch pipeline jobs and its Jenkins webhook.
we always get webhook latency minimum 10 to 20 mins even we have upgraded the plugin from 1.5.7 to 1.5.9 as per below.
but still we experience the issue. Please look into this help us to overcome this issue.[https://plugins.jenkins.io/gitlab-branch-source/#releases]
Delay webhook trigger events to avoid GitLab cache (#145) @cpt1gl0Jenkins version - 2.263.4 (open source)
GitLab Branch Source - 1.5.9