I’m thinking 4-8 smart bulbs, my ring doorbell and my ecobee thermostat and 2 robovacs.
Is that “ a Lot”
Depends on your WiFi setup.
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I figured you say that 
.
Most of us stay away from wifi based devices as most of it is cloud based. I'd throw out the bulbs at least and stick with zigbee 3.0 or z-wave bulbs if you have to have bulbs (I only have a few bulbs for the odd table lamp, everything else is using switches (Lutron Caseta)). I do have a ring doorbell (use the unofficial ring integration installed via Hubitat Package Manager) but may be getting something else so I can dump to my nvr. I have two eufy robovacs but haven't thought about integrating them. I segment my wifi network(s) and use Unifi AP AC-Pro's. Pretty robust wifi network not limited to just one router based wifi hotspot. YMMV....
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Mine will be local. Tp link wifi bulbs can now be local
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No, that's not a lot at all. I have 2 Ecobee thermostats, about 6 Wyze Cams, a Ring Doorbell, one LIFX bulb, some HubDuino ESP8266/ESP32 devices, about 8 Amazon Echos, plus numerous smart phones and tablets, gaming consoles, etc... I do run a full Ubiquiti UniFi network, which is still basically idle with this 'load' on it. The heaviest network users are the 4 streaming AppleTV boxes.
IoT WiFi devices really don't put too much of a load on your home network, IMHO.
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But what is your network? There is no way to answer your question unless we know your setup.
I know it's not "a lot" for my network 
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I had about 70 IP devices, 50ish were wifi. Zero issues, but I'm very strong with networking skills. I'm only switching to zwave and zigbee out of boredom I think. I'm using Mikrotik routers.
Do you think wifi but local bulbs via HomeKit will be slow responding vs zigbee? For $12 I can get much more highly rated kasa bulbs https://www.amazon.com/alexa-smart-light-bulb-wifi/dp/B08TB8QBB1/ref=sr_1_2?dchild=1&keywords=Tp+link+color&qid=1622663949&sr=8-2 and link them to picos via HomeKit or buy off brand zigbee bulbs https://www.amazon.com/Zigbee-Changing-Compatible-Samsung-Smartthings/dp/B08N4LH7GD/ref=sr_1_5?dchild=1&keywords=zigbee+color+light+bulb&qid=1622662877&sr=8-5
No, and I say that from experience using Kasa bulbs locally and linked to Homebridge. But, they may cause problems if they don’t have a really good connection. They will also not turn on/off all at once like Zigbee bulbs can. I only used them in lamps as single bulbs due to this, and eventually put them in a drawer.
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Oh, how much of a difference, like a second or seconds?
I really don't know why they would be 'slow', unless your home network is already fully congested.
Personally, I use Philips Hue smart bulbs, connected to a Hue bridge. They just work. All the time. Every time.
Are they more expensive? Yes.
However...
Do they just work? Yes.
-Every time? Yes.
Do they work with HomeKit? Yes.
Do they work with Hubitat locally? Yes.
Do they work with SmartThings? Yes.
Do they work with Home Assistant locally? Yes.
Do they work with Amazon Alexa? Yes.
Do they work with Google Home? Yes.
Do they work with Logitech Harmony Hub? Yes.
Can you configure their power-restore behavior? Yes.
So, for the above reasons, I am willing to pay a little more for each of my 10 Hue bulbs.
Life's too short for me to spend too much time hacking the firmware on smart bulbs. 
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I have had a request to install 50-70 Shelly devices.
Am I going to have problems?
It's not a unifi router, but it's a few Asus routers in a mesh configuration.
Any comments?
(I'll put all of those wifi devices on a separate network; I will also prevent those devices from reaching the cloud (after setup)).
I intend on controlling those devices from Hubitat.
Any comments?
Exactly. If you are running an older 802.1n (WiFi4) or earlier router, then your router will not be able to handle as many devices. An 802.1ac (WiFi5) or 802.1ax (WiFi6) router.
Make sure everything that can be connected by wired Ethernet is connected that way. Then make sure that any wireless device with 5 GHz capability is using that frequency. Only use 2.4 GHz for devices that do not have 5 GHz capability. That includes most home automation devices.
The fewer devices that are using 2.4 GHz, the more reliable and faster the communication will be with your HA devices.
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A pretty safe rule of thumb for consumer wifi routers/AP’s is ~30 devices per radio.
Thx
Hard to say. It was variable and sometimes one of the lights would just miss the message it seemed. It was also a nightmare after a power outage or router reboot because they often needed turned off and back on manually to get them reconnected. They might work better with my current Linksys router than they did with the Netgear X6S, but I’m not about to find out.
Which is why all of our bedrooms have only Hue lights.
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Sold. I guess I’ll just do white then. $50 per is too rich for my blood
