Trade-off A trade-off (or tradeoff) is a situation that involves losing one quality or aspect of something in return for gaining another quality or aspect.
More colloquially, if one thing increases, some other thing must decrease.
From Wikipedia: https://en.wikipedia.org/wiki/Trade-off
ell.stackexchange.com/users/55363/Lunakshc
So I have to sacrifice capacity in order to gain speed.
Sacrifice: give up (something valued) for the sake of other considerations.
" Sacrifice ," Verb, Definition 2, Google
So I have to compromise capacity in order to gain speed.
Compromise: expediently accept standards that are lower than is desirable.
" Compromise ," Verb, Definition 2, Google
ell.stackexchange.com/users/46453/Teacher KSHuang
Not a singular word, but the phrase “opportunity cost” describes this situation well.
“The opportunity cost of higher speed is a loss of capacity.”
ell.stackexchange.com/users/55383/Andrew
The verb “to gambit” comes from the world of chess and is sometimes employed in other field.
“He gambits this in order to get that.”
The root of the word is the Italian ‘gambetto.’
In the Oxford English dictionary I could only find gambit as a noun, but I’m pretty sure I’ve seen it used as a verb in a phrase as well.
ell.stackexchange.com/users/55369/Evargalo
I kind of like the word 'compensation' for this, though there is some nuance.
It's used in chess as well
: He sacrificed his rook but his position is better so he has compensation.
It's used in other contexts as well of course: I was compensated.
(implies an original loss of something, potentially time or materials)
In your example: We will have less capacity, but this is compensated by an increase in speed.
ell.stackexchange.com/users/55382/Dries De Rydt
The traditional phrase is "a sprat to catch a mackerel".
This dates from the mid 19th century—for example, see this Oxford Reference —and is still current: for example as the title of a book published in 2010 .
ell.stackexchange.com/users/9473/John Bentin
For example I want increase the speed of a memory system in a computer but this will cost more money or decreasing the capacity will also gain more speed.  So I have to lose capacity and money in order to gain speed.More general example,  when losing one quality in return gaining other quality in more technical perspective usage .  So I'm wondering if there is a word out there for this?
Is there a word for losing something in order to gain some other thing?
ell.stackexchange.com
<word-choice><word-request>
ell.stackexchange.com/questions/129595
ell.stackexchange.com/users/51666/Adam
"Compensation" is used in this context, as it implies an original loss of something, possibly time or materials.   Another saying is "using a sprat to catch a mackerel". The word 'compensation' is used in other contexts as well as in chess
The word 'compensation' is used in other contexts as well as in chess. It's used to describe something that has been lost or gained. The traditional phrase is "a sprat to catch a mackerel"