Rancher/lb-service-haproxy:v0.9.13 slow to load when editing

We are still using Rancher 1.6. (I know, I know) We have to manually edit the HAProxy load balancers to add new containers. We now have about 150 entries and as time goes by the interface is loading more and more slowly. I can’t find any bottleneck on the servers hosting the containers. Where else can I look to figure out why it takes so long?

I timed it and it is taking about 20 seconds to come up initially, then another 10 seconds or so before I can scroll down. My concern is that we are getting ready to launch another 30 apps. And it seem that the more containers we add, the slow the interface is. I am worried that eventually it won’t load anymore.