Didn't see any lag myself just a blank page for multiple days now no matter how I try to access it.
Any update on this? I accidentally put a minion in here and would like to take it out to add to my gallery, but it's just blank. :(

Saw someone mention that their minion zoo won't load so I decided to check on mine (it's been a while since I last accessed it) and mine isn't loading either. Header and sidebar load; the rest is blank. I should have 2,289 minions in there according to my profile.
Currently using Chrome for Android v74.0.3729.157 Edit: Won't load in Opera/Win10 either, unsurprisingly
It doesn't load for you even if you wait a couple seconds?
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Well...I tried leaving the page alone to see if it would load. It finally loaded in about 5 minutes on both devices and there was no indication anything was loading the whole time; the loading bar (phone) and favicon (laptop) always load immediately. I tried it again on my laptop and that time it wouldn't load again and I gave it 10+ minutes. I tried opening it again after that and then it loaded after a few seconds. These attempts are all in new tabs rather than reloading the same tab btw.
Then I tried again on my phone. After loading once, it loaded again pretty fast, a few seconds. After a few minutes, I tried loading it again and it's still blank 11 minutes later.
So yeah, it does usually load eventually but it's really hit or miss and that load time is not ideal lol. I'm really sorry, I'm not trying to be a hoarder and break the site! I just like to collect things; they're not duplicates, and I'm anticipating minion achievements. X'D
Mine does the same, but it's my browser's adblocker. For some reason it's taken a dislike to the minion zoo and won't load anything but a white page; turning the adblock off and reloading works immediately.
That's interesting regarding the adblocker. Just for the record though, that can't be the problem on my phone, at least, because Chrome for Android doesn't even support any adblockers/add-ons. Pretty sure it's just a case of too many things trying to load at once for me.
Ah, I came here to report that I can't remove a specific minion from my zoo. And I don't mean any one specific minion; I can't remove any specific minion.
I wanted to remove the pink grasshopper (which the bug catcher wants, and which I zoo'd without turning in first), but after a short delay of clicking "remove" on the grashopper, the page rearranged itself. The grasshopper was still there.
I had to take screenshots to see what was going on, but it seems completely arbitrary minions are being removed. Doesn't matter which one I click, something else is gone instead.
EDIT: I'm a fool. While recording a gif to demonstrate, I finally realised it wasn't arbitrary after all.

The position of the "remove" button makes it seem as though it belongs to the wrong pet. This isn't really a bug, but I'm leaving this post up for posterity (that's a lie, I'm leaving it because there's no delete button)
Ugly but it works:
div.ui.basic.segment.center.aligned div.row div.col-md-2 {background-color: ; max-width: 170px; width: auto; height: auto; flex: unset; -ms-flex:unset; margin-right: 6px; margin-bottom: 6px}
div.ui.basic.segment.center.aligned div.row div.col-md-2 a.ui.button.basic.tiny {position: relative; top: -10px; background-color: !important; color: !important}
You're right: Adblocker wasn't the problem, I must have just got lucky.
Going into the minion zoo today to retrieve a bug I've been stuck on for days, and it was blank - even whitelisted. Turned the adblock completely off, nothing. It took several reloads to get it to pop up (when it did, it came up immediately). Changing pages when it does load has the same problem, but unless you open it as a new tab or something, all it looks like is: the minions stay the same but the page number on the selector changes (so it's still showing page 1, but highlighted page 2).
It does show up after 3-6? page loads (each), but if it hasn't loaded in a second or two it's not likely to at all.
Same blank page, I can't remove any minions
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Deployed a fix for the blank page issue!
It might still take a few seconds to load, but it should at least successfully load now if you wait a bit.
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thank you so much!!
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Yaaay~! My pet can finally eat her fill of the edible minions! :D
I accidentally put my Lotus Poem Millipede in the minion zoo before completing the Bug Catching quest, at the minion zoo the blank page says "Loading, please wait..." for over 15 minutes now.
RIP Mom, I love & miss you more than you know. Tell Dede hi.
Ocean Conservation Namibia on YouTube... they do good work! https://www.ocnamibia.org
Is it still failing to load now?
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Thank you, it loaded this time. I had to give up yesterday.
RIP Mom, I love & miss you more than you know. Tell Dede hi.
Ocean Conservation Namibia on YouTube... they do good work! https://www.ocnamibia.org
Still not loading for me :(
I'm having the exact same issue. Accidentally put my Fox Moth in the minion zoo before turning it in, and now I can't get anything in the MZ to load. The first time I went in, only the first page of the zoo would load, but I couldn't get to any other pages, so I refreshed the page. Now, it's been around 15 minutes and I just get "Loading, please wait..."