The latest suggestions and state of the Mess in Amsterdam of Summer '22 - short staffing and security issues.

Starting late April/early May 2022, Amsterdam Airport Schiphol is showing signs of chronic, and at times extreme, overcrowding. This thread is dedicated largely to the discussion of the same.

We have created this wiki to have a single point of reference, updated periodically with tips, tricks and reports of current state.

Bottlenecks

As of June 2nd, there are 2 bottlenecks at the airport.
1. Entrance to the terminal building from outside (arrival by car)
2. Security checks.

As of June 20th, unsatisfactory situation has been reported also on all arrival passport checks.

Tips to deal with Entrance to the terminal building lines

As of July 3rd, you could enter the terminal from train station without hindrance. On travel heavy days, consider getting dropped off at Hoofdorp, Zuid or Lelylaan and taking a train one station instead.
Privium holders are reportedly able to bypass lines by showing the Privium card.
Note: Schiphol is sometimes limiting access to passengers 4 hours before the flight, both from outside and through Schiphol plaza.
The checks do happen, but you are very likely to be able to bypass them from Schiphol Plaza (arrival by train or bus) by using the lift or stairs instead of inclined travelators.

Tips to deal with Security lines

There are currently three departure checkpoints into the main terminal area (plus one for the lowcost wing). Departures 1 and 2 are used for Schengen flights, Departures 2 and 3 for non-Schengen. (You can, however, turn left after leaving checkpoint for Departures 1 and reach exit control).
You don't have to use the checkpoint in your airlines departure area, so check if one of the other ones has a shorter line. However keep in mind that transfer passport control might bring additional delay.
If you have priority, ignore the main entrances to the checkpoints, particularly 1 and 2. Especially ignore the line for the stairs to checkpoint 2. Enter via SkyPriority zone, either via front if you have STE+/SP, or via back from Oversized Baggage point. There is a Privium card reader if you are a holder, alternatively sneak by opening one-way gate by hand.
The stairs at the back of SP zone are now official and only access point for priority for Schengen. The position is manned and access rules are strictly enforced.
Once upstairs, you can enter the lines for Departures 2 directly, or take a left, then another left, and you'll find yourself in Departures 1 checkpoint area.
Once upstairs, staff direct you either to enter rightmost lane in checkpoint 2, or to turn left to proceed to leftmost lane of checkpoint 1.
Privium holders can alternatively use Privium gates at otherwise closed Departures 1 checkpoint entry (behind check-in row 3), join the rightmost lane of checkpoint 1. There is going to be some mixing with non-prio pax at the filter, but on the upside, there is guaranteed no non-Privium priority pax coming up the stairs so you are virtually guaranteed to have no more than ~5 people in the queue immediately in front of the filter.

Tips to deal with Immigration / Passport Control lines

There are four options for arriving (from secure location) passengers. One is to use transfer passport control, one is to use passport control by F gates and another is to use passport control by E gates. There are also stairs by end of D pier next to the transfer control. All these feed into different lines.
There is no trick, just see if one of the other ones is shorter, depending on where the majority of recently arrived flights are docked.

Passengers arriving from unsecure locations cannot reach these without going through transit security. The only option is to follow the signs for entry control.

If you really want to make sure you're safe and are willing to pay extra

Schiphol VIP services are available at 390 for the first, 175 for each additional passenger (excl. VAT; with VAT rates are 471.90+211.75)
VIP service is at capacity and is not accepting new reservations.

General timeline suggestions

For Privium passengers, 1 hour should be comfortable in almost all cases.
For SkyPriority passengers, 1.5 hours should be comfortable in almost all cases.
For other priority passengers, it really depends on whether the priority lines are open but I would personally aim for 1.5 - 2 hours. Worst case you can sneak into the SkyPriority area from the back and use the gates there (your BP will be accepted). The priority line behind SP area is now open to all prio pax.
For non-priority passengers, realistically, 4 hours should be enough except at the worst times. Anyone informed enough to post here will probably also understand that the entire airport (except the easyJet gates I guess) is connected airside and you can shop around the different security areas depending on how bad the lines look.

Common Questions

I'm transferring from a non-schengen to a non-schengen flight in XX, will I make it?
Yes, you will. Non-schengen to non-schengen transfers happen by first arriving at AMS.
If you arrive from a secure area (EU, UK, US, Canada, direct non-stop SIN): You then navigate yourself within the departures area to your non-schengen flight out of AMS and this takes less than 20 minutes, even if you have to walk from D gates to G gates.
If you arrive from non-secure area (other than mentioned; SIN flights via DPS): You will have to follow transit signs for transit security. There are no reports of transit security taking unusually long.

If you want to print your BP for the next segment, there are many transfer check-in machines across the non-schengen gates for you to print your BP, do check-in/document check, change seat, and etc for your next flight. No security or immigration is involved and odds are, you will wait at the gate for boarding, If you are FB Gold and up, STE+, or flying in business class, you will have access to the Crown Lounge and can grab a bite, get some work done, take a shower, or rent one of the sleeping pods depending on how long your transit is.