Last updated: Sep 2023
Donāt get me wrong, I 
Asana but like everything, it has its limits, which is sometimes perfectly fine, especially if you know what/where those limits are 
Most of the below limitations are extreme use cases required to handle large amounts of data, so likely these wonāt be an issue to the majority of users.
limitations marked with an exclamation, could not be found in the guide, but are mentioned in the forum, thus the relevant links.
limitations marked with a tick are noted in the Asana Guide but can be easily missedā¦
So letās vote here to get a comprehensive list added to the Asana guide - it would be beneficial to have these limitations more accessible/public as they may be deciding factors on HOW (not IF) one may go about setting up large organizations before running into performance & usage issues 
To add to the list, just add your comment below!
1. Custom Fields
Asana Guide link to general Field types and limitations
1.1. Reordering options within a Single-Select or Multi-select custom field
1.1. Reordering options within a Single-Select or Multi-select custom fieldNo longer a limitation!
Not sure if the 25k task limit is precise - it may have to do with more parameters than just task count. I met this limitation closer to reaching only 5k tasks but with tens of projects using the same single-select field which had over 50 options. Whatever the limit, it would also be nice to know if the same applies to multi-select fields.
when adding a new option to a single-select custom field with many options, instead of using the ā+ Add an optionā button at the bottom of the options list, you can āinsertā a new option in-between existing options by selecting the option directly above and hitting āenterā.
1.2. Limit of 500 options within a Single-select or Multi-select custom field
Expand for details
Asana Guide link 
Forum closed topic
This number was vastly increased during 2022, currently set to 500 (!!) for single-select options and multi-select options. Asana can put this one to bed for the time being!
1.3. Limit of 100 custom fields within a single project
Expand for details
Asana Guide link Forum closed topic
Increased in May 2023 from 30 to 100 custom fields (plus the 9 default/metadata fields, eg. assignee, due date, created by etc.). Thanks @Andrea_Mayer for raising this here.
1.4. Limit of 100 custom fields within a single portfolio
Expand for details
Asana Guide link
Increased in May 2023 from 30 to 100 custom fields
1.5. Limit of 60 custom fields displayed within a single taskās task pane
Expand for details
Asana Guide link mentions: You can have up to 60 fields per task (this can be achieved by multi-homing a single task to multiple projects).
Since the increase in May 2023, from 30 to 100 custom fields within a project, (see 1.3) this means that a single task can be multihomed to numerous projects that contain 100 custom fields each. However, only the first 60 custom fields are displayed in the taskās pane. The order of the fields displayed is likely deduced by the projectās creation date. I tested multi-homing a task to 5 projects containing 100 custom fields each (500 in total) without any errors but some slightly notable drop in performance, just not as snappy, thatās all.
2. Rules
Asana Guide link to general Rule types and limitations
2.1. Limit of 50 Rules that can be setup within a single project
Expand for details
Vote here to increase Asana Guide link
This might be limiting to some users but there are workarounds using multi-homing
2.2. Limit of 20 Triggers per custom rule
Expand for details
2.3. Limit of 5 Actions per custom rule
Expand for details
Vote here to increase Asana Guide link
As a workaround, you can create another custom rule with the exact same Triggers to cause another 5 Actions and so onā¦
2.4. Limit of 20 subtasks within āCreate subtasksā rule
Expand for details
Asana Guide link
Thanks to @Lucho_Soto for raising this and noting it here.
Interestingly enough, there does not appear to be a limitation on how many subtasks can be added within these 20 subtasks. I reached 51 subtasks and stopped testing - this appears to be limitless, similar to subtasks within Task templates, refer to 4.1 below.
3. Forms
3.1. Limit of 500 questions (or section headings) within a single form
Expand for details
Vote here to increase
Although officially announced at 200 limit, I managed to hit the limit at 500 questions, although there is a warning notification once past the 150 mark that reads āForms with more than 150 questions can be slow to loadā which indeed took about 10 seconds to load, but works!
No reference currently in the guide
3.2. Limit of 20 forms within a single project
Expand for details
At the time of writing, the guide refers to 5 forms per project, although confirmed in the forum to be indeed 20 forms per project as of Dec 2022. Note, multiple forms are only available for Business & Enterprise Plans.
3.3. Limit of 25MB per file uploaded as an attachment to a form submission
Expand for details
Voting here may help!
No reference currently in the guide but confirmed in the forum
3.4. Limit of 5 levels of branches (conditional logic) within a Form
Expand for details
4. Tasks, Subtasks & Sections
4.1. Limit of 50 task templates within a single project
Expand for details
Vote here to increase
No reference currently in the guide but confirmed in the forum here.
Increased from 10 to 20 in Sep 2022 and from 20 to 50 in April 2023.
There also appears to be no limit of subtasks within a task template. I reached 51 and stopped testing.
4.2. Limit of 30 - 45 dependencies linked to a single task
Expand for details
Vote here to increase
No reference currently in the guide. Currently this limitation is not consistent throughout Asana, as pointed out by @Phil_Seeman in his post below.
4.3. Limit of 20 projects that a single task can be multi-homed to
Expand for details
4.4. Limit of 60 custom fields within a single task
Refer to 1.5 above
4.5. Limit of 50 tasks selected at once to perform multi-select actions
Expand for details
Vote here to increase. No reference currently in the guide.
4.6. Limit of 1000 visible tasks within a section for it to be collapsible
Expand for details
i.e. in List view, a Section cannot be collapsed if it contains more than 1000 tasks that are visible. eg. if the āIncomplete tasksā filter shows less than 1000 tasks, even though there are more than 1000 tasks in the section (e.g completed tasks also), the section will still be collapsible. No reference currently in the guide.
4.7. Limit of 100MB per file uploaded as an attachment to a task/comment
Expand for details
Vote here to increase Asana Guide link mentions: If you have a larger file, consider attaching it from Dropbox or Google Drive. There is no storage limit for the number of files you can upload.
4.8. Limit of 5 levels of Subtasks
Expand for details
Asana Guide link mentions: You can create subtasks within subtasks, but you can only have a maximum of 5 levels of subtasks
Vote here to DEcrease 
4.9. Limit of 30 Subtasks to calculate column function of custom fields
Expand for details
Vote here to increase
Once the 31st subtask is added to a task, the column function (Sum, Average, Count etc) in the List view of a project provides an error that the resulting value can no longer be calculated (as it did for up to 30 subtasks). This applies to all number-type custom fields such as numbers, percent, currency and time tracking. Additionally, if any sort is applied to the List view, the value of the subtasks no longer roll up as shown in the guide; instead only the value of the parent task is displayed. 
4.10. Limit of collaborators within a task (?)
Expand for details
I tested this limit by adding just over 100 collaborators within a task. And thatās where I stopped
No reference currently in the guide.
4.11. Limit of 2000 tasks with due dates for Critical Path in Timeline
Expand for details
Asana Guide link. Increased in Apr 2023 from 100 to 2000 tasks
4.12. Limit of 1000 comments within a task
Expand for details
No reference currently in the guide. Thanks @Andrea_Mayer for discovering this here.
4.13. Limit of 65,000 (approx.) characters in a taskās description
Expand for details
No reference currently in the guide, but noted in the forum here.
Thanks @Andrea_Mayer for raising this and noting it here.
4.14. Limit of 20 subtasks within āCreate subtasksā rule
Refer to 2.4 above
5. Portfolios & Workload
Asana Guide link to Portfolios FAQ
5.1. Limit of 500 projects added to a single Portfolio
Expand for details
Vote here to increase
Asana Guide link and as per release notes of Aug 2022 but see 5.2. belowā¦
5.2. Limit of 250 projects added to a single Portfolio for Workload to function
Expand for details
Vote here to increase, thanks to @lpb & @Bastien_Siebman for noting this.
5.3. Limit of 100 custom fields within a single portfolio
Refer to 1.4 above
5.4. Limit of 300 tasks per person viewable in Workload
Expand for details
Applies to both Workload of a Portfolio as well as Universal Workload in Reporting.
No reference currently in the guide. Thanks to @Arthur_BEGOU for noting this here and here.
6. Dashboards & Reporting
6.1. Limit of 20 items/charts in a Dashboard of a Project
Expand for details
Vote here to increase
Asana Guide link mentions the limit as 15 items, however, you can currently add 20 items/charts.
6.2. Limit of 20 items/charts in a Dashboard in Universal Reporting
Expand for details
Vote here to increase
This appears to be limited to 20 items, although there is no reference in the guide.
7. Importing & Exporting
7.1. Limit of 2,000 rows for importing a CSV file into a project (?)
Expand for details
Vote here to increase
Although not 100% confirmed, and no notes currently in the Asana guide, there are reported performance issues beyond this limit. Thanks to @Bastien_Siebman for suggesting this.
7.2. Limit of 140,000 rows for exporting a CSV file from a project
Expand for details
Although technically in the Asana guide under release notes for May 2022 (and here in the forum), this is not mentioned in the guideās relevant article, here.
7.3. Limit of 2,000 rows for exporting a CSV file from a Search result
Expand for details
Forum closed topic
Unlike 7.2, exports from search results are apparently still limited to 2,000 rows of a CSV, as reported here.
8. Views, Sorting & Filtering
8.1. Limit of 1,000 tasks in a Project List view to be able to sort tasks by assignee
Expand for details
Forum closed topic
Not sure this one still applies? We have a project with over 5k tasks and can sort by assignee perfectly fineā¦ 
8.2. Limit of 1,000 tasks in My Tasks to be able to sort tasks in List & Board view
Expand for details
Beyond 1,000 tasks, an error will occur when sorting by Start Date, Created by, Last modified on and custom fields. However, even beyond this limit, sorting seems to work as expected for Due Date, Created on, Likes, Alphabetical & Project. Thanks to @Bastien_Siebman for raising this here.
8.3. Limit of 10 sorts and 10 filters in List & Board view
Expand for details
No reference currently in the guide.
You can use a total of 20; i.e. up to 10 filters and up to 10 sorts.
To sort a multi-select field or a people type field, they must be applied first in the sort list. Therefore, you cannot sort by more than one multi-select field or people field or both, but you can sort by one of these two types and then numerous single-select, date, text or number fields (including native Estimated and Actual time fields).
8.4. Limit of 12 tabs of saved views in projects
Expand for details
No reference currently in the guide, but confirmed in the forum here.
You can add a total of 12 tabs of the same type; i.e. you can have up to 12 List views if you remove all other tabs such as Overview, Board, Timeline etc.
9. File Size Attachments
9.1. Limit of 100MB per file uploaded as an attachment to a task/comment
Refer to 4.7 above
9.2. Limit of 25MB per file uploaded as an attachment to a form submission
Refer to 3.3 above
10. Read-only links (shareable Project views)
10.1. Limit of 200 tasks displayed in read-only List view
Expand for details
No reference currently in the guide
Note, the shared List view displays the first 200 tasks sorted by āNoneā order, only.
10.2. Limit of 200 tasks displayed in read-only Board view, maximum 50 per column
Expand for details
No reference currently in the guide
Note, that the shared Board view displays the latest 50 tasks added to a column.
10.3. Limit of 100 tasks displayed in read-only Timeline view
Expand for details
No reference currently in the guide
Note, that the shared Timeline view displays the first 100 tasks in sorted by date. Although one cannot scroll to the left or right of the timeline, one can use the zoom controls to Month/Year to display more tasks, these will still remain no more than 100 being displayed.
10.4. Limit of 100 tasks displayed in read-only Calendar view
Expand for details
No reference currently in the guide. Thanks to @Bastien_Siebman for raising this.
Interestingly, this limit applies irrelevant to however many tasks are due on different days or due on the same day. However, if tasks are due on the same day, the most recent tasks added to that day will appear first, before reaching the 100 task limit, therefore possibly only showing some of the total number of tasks on that particular day. 
11. Teams & Projects
11.1. Limit of 100 projects for the Team page > Calendar view to function
Expand for details
No reference currently in the guide. If there are more than 100 projects within a Team, then that Teamās Calendar view will be disabled. Thanks to @Bastien_Siebman & @lpb for raising this here.
12. Goals
12.1. Limit of 10 projects or portfolios connected to a Goalās progress
Expand for details
Asana Guide link. Thanks @Arthur_BEGOU for noting this here.
12.2 Limit of 100 subgoals connected to a Goalās progress
Expand for details
13. Bundles
Asana Guide link to Bundles FAQ
13.1. Limit of 5 bundles added to a single project
Expand for details
Asana Guide link. Thanks @Arthur_BEGOU for noting this here.
13.2. Limits of Custom fields, Rules and Task templates within a bundle
Expand for details
The limits of these features respect the current limitations. Refer to 1.3, 2.1 & 4.1 above but also take note of @Arthur_BEGOUās post here.
Iām sure thereās more to add so please let me know and help keep this post updated
As noted in the original thread, Iāve been pushing for such a comprehensive limits list for years now; no luck so far. But I love that you started a list with the post you made. I merged the two topics so we pick up the votes from the other one. (Be sure to add your vote, also!)
?
