Don Durito
Hero
It could be. Pre 3E (and to an extent even 3E at low levels depending how you approached it) you mostly did one thing on your turn.
In 5E (as in 4E) it's not unusual to do more than one thing on your turn. This creates an arms race of sorts. It makes sense that if you have to wait some time for your turn then you need to do more, but it also means each turn will take longer. I'm more then half convinced that 5E ended up giving multi-attacks to warriors mostly for spotlight reasons.
But always the organisation of the players, and particulary of the GM makes a massive difference to how fast combat can run.
Another thing that makes a difference is that older styles of play had a lot more of what I've seen around here called "trash fights" - short combats that aren't usually likely to seriously threaten pcs (although notably even these could be a lot scarier in earlier editions if they were things like giant spiders with poison), but are there to drain resources. These fights have always been resolved a lot more quickly.
Once the game moved more toward the idea of set piece combats that challenge the party, then combat inevitably slowed. Basically you can't really have your cake and eat it too. If you want an epic combat to take place across multiple vertical levels with reinforcements arriving halfway through and various terrain effects then it is going to take time.
In 5E (as in 4E) it's not unusual to do more than one thing on your turn. This creates an arms race of sorts. It makes sense that if you have to wait some time for your turn then you need to do more, but it also means each turn will take longer. I'm more then half convinced that 5E ended up giving multi-attacks to warriors mostly for spotlight reasons.
But always the organisation of the players, and particulary of the GM makes a massive difference to how fast combat can run.
Another thing that makes a difference is that older styles of play had a lot more of what I've seen around here called "trash fights" - short combats that aren't usually likely to seriously threaten pcs (although notably even these could be a lot scarier in earlier editions if they were things like giant spiders with poison), but are there to drain resources. These fights have always been resolved a lot more quickly.
Once the game moved more toward the idea of set piece combats that challenge the party, then combat inevitably slowed. Basically you can't really have your cake and eat it too. If you want an epic combat to take place across multiple vertical levels with reinforcements arriving halfway through and various terrain effects then it is going to take time.