Help with calculation speed

What exercises can I do to improve calculation speed. I burn too much time on the clock calculating captures, for example. 

Play slower time controls.

First you get good. THEN you get fast.

+1, In other word,

Technique fast, speed later.

just go man, trust your instinct

As a musician I'm sure you already know that the ability to be fast and accurate is the result of first being slow and accurate.

For example untimed tactic puzzles where your goal is accuracy.

But if that's all you do, you'll stay slow. You'll eventually want to give yourself time constraints.

Playing fast games can help with this too. I see you play a lot of 15|10. So maybe try some 10 | 0. This will feel shockingly fast in comparison and will force you to develop new skills to compensate. For example maybe a problem right now is you calculate 3 different lines, then you forget the first line and recalculate it. Of course double checking is normal and we all do it, but if you're calculating 3 lines 4 times each that's no good and you can be more efficient.

One thing that helped me was writing out my analysis and thoughts while solving a puzzle (or playing against an engine). So for example a 3 move variation, then an evaluation (white is a little better) and why (I like white's big center and black's pieces are passively defending)

Then I'd review it for inefficiency... I mean, sometimes during the process itself I'd realize I'd spent too much time looking at one thing that didn't work, when if I'd just looked around for alternatives instead going down the rabbit hole of calculation I could have saved a lot of time. So I'd write that down and circle it.

Of course sometimes you need to calculate before looking at a lot of candidate moves, but other times it's the opposite. There's no quick fix, but when you have a goal (like getting faster) and you critically examine your process, you'll notice common errors and find ways to fix stuff. That plus practice and you'll see improvement.

Thanks to all for the contributions to this topic. 

I was a band and orchestra teacher, always instructing my students to play slow and strive for accuracy, then gradually increase the tempo. So, relating this to precise time measurements, like a chess clock, in music a metronome is used to measure progress, I.e, practice fast passages first at slow tempos, like 80 beats per minute, increasing by 5 or 10 until the performance speed is reached, 120bpm, for example. Then, I would ask them to work towards playing the passage with 100% accuracy at 130bpm, even better, 140bpm. This ensures that during the performance, factoring in nerves, they will have no problem with execution at 120bpm. 

15 10 is really like 120bpm in music. Maybe 45 minutes per side would feel like 80bpm, where you feel relaxed and can play with great accuracy. 

I’m going to try playing against a computer at 45-60, to really give myself a chance to think, practice all those good habits, like looking for checks, captures and threats for both sides. Asking myself what the piece was doing, and what it will be doing on a future square. Looking to stop my opponents counterplay, giving myself the time to develop better middlegame plans, and on and on. 

I remember NM Dan Heisman recommending 45 45 for improvement. Can you imagine a 45 second increment per move? Wow! 

It looks like I should apply all the mental discipline and focused practice I used to perfect my own play on a musical instrument to chess. I see the similarities, especially with memorization and pattern recognition. It would be ridiculous to think I could ever become proficient on a musical instrument with sloppy, hurried practice. 

I can start seeing blitz chess like I would see a timed test in music. You need to play well at a slow speed before you can play at a blistering tempo. It’s really the only way. 

I have a topic where you can test your brainspeed.