# Slow compilation times due to Low RAM available on machine

**URL:** <https://discourse.julialang.org/t/slow-compilation-times-due-to-low-ram-available-on-machine/138696>\
**Category:** New to Julia\
**Created:** [August 8, 2026, 10:50pm UTC](https://discourse.julialang.org/t/slow-compilation-times-due-to-low-ram-available-on-machine/138696 "2026-08-08T22:50:23Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Tech\_Monk](https://avatars.discourse-cdn.com/v4/letter/t/51bf81/32.png) [@Tech\_Monk](https://discourse.julialang.org/u/Tech_Monk)\
**Post date:** [August 8, 2026, 10:50pm UTC](https://discourse.julialang.org/t/slow-compilation-times-due-to-low-ram-available-on-machine/138696/1 "2026-08-08T22:50:23Z")

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Each time I build julia with make -j4 it takes excruciatingly long..  
Is there any solution to make this faster, each compile takes an hour or so..

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**Author:** ![Oscar\_Smith](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/oscar_smith/32/25343_2.png) [@Oscar\_Smith](https://discourse.julialang.org/u/Oscar_Smith)\
**Post date:** [August 8, 2026, 11:35pm UTC](https://discourse.julialang.org/t/slow-compilation-times-due-to-low-ram-available-on-machine/138696/2 "2026-08-08T23:35:56Z")

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several things can help here. CCache will reduce the amount of recompilation necessary. configuring swap appropriately (e.g. zswap for compressed memory) will also help. lastly, if you have get little ram you may want to not pass -j as it does increase the memory used

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**Author:** ![viktoriyanavrotskaya](https://avatars.discourse-cdn.com/v4/letter/v/59ef9b/32.png) [@viktoriyanavrotskaya](https://discourse.julialang.org/u/viktoriyanavrotskaya)\
**Post date:** [August 10, 2026, 6:20am UTC](https://discourse.julialang.org/t/slow-compilation-times-due-to-low-ram-available-on-machine/138696/3 "2026-08-10T06:20:08Z")

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The biggest issue is probably running `make -j4` with limited RAM. More parallel jobs can actually slow things down if the system starts swapping. Try lowering the job count, use ccache for repeated builds, and make sure swap/zswap is configured properly. More RAM will also make a noticeable difference.